## Calculate radius from diameter
def radius_from_diameter(diameter):
    if diameter <= 0:
        raise ValueError("Diameter must be greater than zero.")
    return diameter / 2

## Example usage
d = 10
r = radius_from_diameter(d)
print(f"The radius is {r} units.")

// Calculate radius from diameter
function radiusFromDiameter(diameter) {
    if (diameter <= 0) {
        throw new Error("Diameter must be greater than zero.");
    }
    return diameter / 2;
}

// Example usage
let d = 10;
let r = radiusFromDiameter(d);
console.log(`The radius is ${r} units.`);

public class CircleRadiusCalculator {
    public static double radiusFromDiameter(double diameter) {
        if (diameter <= 0) {
            throw new IllegalArgumentException("Diameter must be greater than zero.");
        }
        return diameter / 2;
    }

    public static void main(String[] args) {
        double d = 10;
        double r = radiusFromDiameter(d);
        System.out.printf("The radius is %.2f units.%n", r);
    }
}

// Calculate radius from diameter
#include <iostream>
#include <stdexcept>

double radiusFromDiameter(double diameter) {
    if (diameter <= 0) {
        throw std::invalid_argument("Diameter must be greater than zero.");
    }
    return diameter / 2.0;
}

int main() {
    double d = 10.0;
    try {
        double r = radiusFromDiameter(d);
        std::cout << "The radius is " << r << " units." << std::endl;
    } catch (const std::exception& e) {
        std::cerr << e.what() << std::endl;
    }
    return 0;
}

## Calculate radius from diameter
radius_from_diameter <- function(diameter) {
  if (diameter <= 0) {
    stop("Diameter must be greater than zero.")
  }
  return(diameter / 2)
}

## Example usage
d <- 10
r <- radius_from_diameter(d)
cat(sprintf("The radius is %.2f units.\n", r))

## Calculate radius from diameter
def radius_from_diameter(diameter)
  raise ArgumentError, "Diameter must be greater than zero." if diameter <= 0
  diameter / 2.0
end

## Example usage
d = 10
r = radius_from_diameter(d)
puts "The radius is #{r} units."

<?php
// Calculate radius from diameter
function radiusFromDiameter($diameter) {
    if ($diameter <= 0) {
        throw new Exception('Diameter must be greater than zero.');
    }
    return $diameter / 2;
}

// Example usage
$d = 10;
$r = radiusFromDiameter($d);
echo "The radius is {$r} units.";
?>

// Calculate radius from diameter
fn radius_from_diameter(diameter: f64) -> Result<f64, &'static str> {
    if diameter <= 0.0 {
        return Err("Diameter must be greater than zero.");
    }
    Ok(diameter / 2.0)
}

fn main() {
    let d = 10.0;
    match radius_from_diameter(d) {
        Ok(r) => println!("The radius is {:.2} units.", r),
        Err(e) => println!("{}", e),
    }
}

import Foundation

// Calculate radius from diameter
func radiusFromDiameter(_ diameter: Double) throws -> Double {
    if diameter <= 0 {
        throw NSError(domain: "InvalidInput", code: 0, userInfo: [NSLocalizedDescriptionKey: "Diameter must be greater than zero."])
    }
    return diameter / 2.0
}

// Example usage
do {
    let d = 10.0
    let r = try radiusFromDiameter(d)
    print("The radius is \(r) units.")
} catch {
    print(error.localizedDescription)
}

import math

## Calculate radius from circumference
def radius_from_circumference(circumference):
    if circumference <= 0:
        raise ValueError("Circumference must be greater than zero.")
    return circumference / (2 * math.pi)

## Example usage
C = 31.4159
r = radius_from_circumference(C)
print(f"The radius is {r:.2f} units.")

// Calculate radius from circumference
function radiusFromCircumference(circumference) {
    if (circumference <= 0) {
        throw new Error("Circumference must be greater than zero.");
    }
    return circumference / (2 * Math.PI);
}

// Example usage
let C = 31.4159;
let r = radiusFromCircumference(C);
console.log(`The radius is ${r.toFixed(2)} units.`);

public class CircleRadiusCalculator {
    public static double radiusFromCircumference(double circumference) {
        if (circumference <= 0) {
            throw new IllegalArgumentException("Circumference must be greater than zero.");
        }
        return circumference / (2 * Math.PI);
    }

    public static void main(String[] args) {
        double C = 31.4159;
        double r = radiusFromCircumference(C);
        System.out.printf("The radius is %.2f units.%n", r);
    }
}

// Calculate radius from circumference
#include <iostream>
#include <cmath>
#include <stdexcept>

double radiusFromCircumference(double circumference) {
    if (circumference <= 0) {
        throw std::invalid_argument("Circumference must be greater than zero.");
    }
    return circumference / (2.0 * M_PI);
}

int main() {
    double C = 31.4159;
    try {
        double r = radiusFromCircumference(C);
        std::cout << "The radius is " << r << " units." << std::endl;
    } catch (const std::exception& e) {
        std::cerr << e.what() << std::endl;
    }
    return 0;
}

## Calculate radius from circumference
radius_from_circumference <- function(circumference) {
  if (circumference <= 0) {
    stop("Circumference must be greater than zero.")
  }
  return(circumference / (2 * pi))
}

## Example usage
C <- 31.4159
r <- radius_from_circumference(C)
cat(sprintf("The radius is %.2f units.\n", r))

## Calculate radius from circumference
def radius_from_circumference(circumference)
  raise ArgumentError, "Circumference must be greater than zero." if circumference <= 0
  circumference / (2 * Math::PI)
end

## Example usage
C = 31.4159
r = radius_from_circumference(C)
puts "The radius is #{format('%.2f', r)} units."

<?php
// Calculate radius from circumference
function radiusFromCircumference($circumference) {
    if ($circumference <= 0) {
        throw new Exception('Circumference must be greater than zero.');
    }
    return $circumference / (2 * M_PI);
}

// Example usage
$C = 31.4159;
$r = radiusFromCircumference($C);
echo "The radius is " . round($r, 2) . " units.";
?>

use std::f64::consts::PI;

// Calculate radius from circumference
fn radius_from_circumference(circumference: f64) -> Result<f64, &'static str> {
    if circumference <= 0.0 {
        return Err("Circumference must be greater than zero.");
    }
    Ok(circumference / (2.0 * PI))
}

fn main() {
    let C = 31.4159;
    match radius_from_circumference(C) {
        Ok(r) => println!("The radius is {:.2} units.", r),
        Err(e) => println!("{}", e),
    }
}

import Foundation

// Calculate radius from circumference
func radiusFromCircumference(_ circumference: Double) throws -> Double {
    if circumference <= 0 {
        throw NSError(domain: "InvalidInput", code: 0, userInfo: [NSLocalizedDescriptionKey: "Circumference must be greater than zero."])
    }
    return circumference / (2 * Double.pi)
}

// Example usage
do {
    let C = 31.4159
    let r = try radiusFromCircumference(C)
    print(String(format: "The radius is %.2f units.", r))
} catch {
    print(error.localizedDescription)
}

import math

## Calculate radius from area
def radius_from_area(area):
    if area <= 0:
        raise ValueError("Area must be greater than zero.")
    return math.sqrt(area / math.pi)

## Example usage
A = 78.5398
r = radius_from_area(A)
print(f"The radius is {r:.2f} units.")

// Calculate radius from area
function radiusFromArea(area) {
    if (area <= 0) {
        throw new Error("Area must be greater than zero.");
    }
    return Math.sqrt(area / Math.PI);
}

// Example usage
let A = 78.5398;
let r = radiusFromArea(A);
console.log(`The radius is ${r.toFixed(2)} units.`);

public class CircleRadiusCalculator {
    public static double radiusFromArea(double area) {
        if (area <= 0) {
            throw new IllegalArgumentException("Area must be greater than zero.");
        }
        return Math.sqrt(area / Math.PI);
    }

    public static void main(String[] args) {
        double A = 78.5398;
        double r = radiusFromArea(A);
        System.out.printf("The radius is %.2f units.%n", r);
    }
}

// Calculate radius from area
#include <iostream>
#include <cmath>
#include <stdexcept>

double radiusFromArea(double area) {
    if (area <= 0) {
        throw std::invalid_argument("Area must be greater than zero.");
    }
    return std::sqrt(area / M_PI);
}

int main() {
    double A = 78.5398;
    try {
        double r = radiusFromArea(A);
        std::cout << "The radius is " << r << " units." << std::endl;
    } catch (const std::exception& e) {
        std::cerr << e.what() << std::endl;
    }
    return 0;
}

## Calculate radius from area
radius_from_area <- function(area) {
  if (area <= 0) {
    stop("Area must be greater than zero.")
  }
  return(sqrt(area / pi))
}

## Example usage
A <- 78.5398
r <- radius_from_area(A)
cat(sprintf("The radius is %.2f units.\n", r))

% Calculate radius from area
function r = radius_from_area(area)
    if area <= 0
        error('Area must be greater than zero.');
    end
    r = sqrt(area / pi);
end

% Example usage
A = 78.5398;
r = radius_from_area(A);
fprintf('The radius is %.2f units.\n', r);

using System;

class CircleRadiusCalculator
{
    public static double RadiusFromArea(double area)
    {
        if (area <= 0)
            throw new ArgumentException("Area must be greater than zero.");
        return Math.Sqrt(area / Math.PI);
    }

    static void Main()
    {
        double A = 78.5398;
        double r = RadiusFromArea(A);
        Console.WriteLine("The radius is {0:F2} units.", r);
    }
}

package main

import (
	"fmt"
	"math"
)

func radiusFromArea(area float64) (float64, error) {
	if area <= 0 {
		return 0, fmt.Errorf("Area must be greater than zero.")
	}
	return math.Sqrt(area / math.Pi), nil
}

func main() {
	A := 78.5398
	r, err := radiusFromArea(A)
	if err != nil {
		fmt.Println(err)
		return
	}
	fmt.Printf("The radius is %.2f units.\n", r)
}

## Calculate radius from area
def radius_from_area(area)
  raise ArgumentError, "Area must be greater than zero." if area <= 0
  Math.sqrt(area / Math::PI)
end

## Example usage
A = 78.5398
r = radius_from_area(A)
puts "The radius is #{format('%.2f', r)} units."

<?php
// Calculate radius from area
function radiusFromArea($area) {
    if ($area <= 0) {
        throw new Exception('Area must be greater than zero.');
    }
    return sqrt($area / M_PI);
}

// Example usage
$A = 78.5398;
$r = radiusFromArea($A);
echo "The radius is " . round($r, 2) . " units.";
?>

use std::f64::consts::PI;

// Calculate radius from area
fn radius_from_area(area: f64) -> Result<f64, &'static str> {
    if area <= 0.0 {
        return Err("Area must be greater than zero.");
    }
    Ok((area / PI).sqrt())
}

fn main() {
    let A = 78.5398;
    match radius_from_area(A) {
        Ok(r) => println!("The radius is {:.2} units.", r),
        Err(e) => println!("{}", e),
    }
}

import Foundation

// Calculate radius from area
func radiusFromArea(_ area: Double) throws -> Double {
    if area <= 0 {
        throw NSError(domain: "InvalidInput", code: 0, userInfo: [NSLocalizedDescriptionKey: "Area must be greater than zero."])
    }
    return sqrt(area / Double.pi)
}

// Example usage
do {
    let A = 78.5398
    let r = try radiusFromArea(A)
    print(String(format: "The radius is %.2f units.", r))
} catch {
    print(error.localizedDescription)
}

## Calculate radius from diameter in cell B1
=IF(B1>0, B1/2, "Invalid input")

## Calculate radius from circumference in cell B2
=IF(B2>0, B2/(2*PI()), "Invalid input")

## Calculate radius from area in cell B3
=IF(B3>0, SQRT(B3/PI()), "Invalid input")