Answer to Question #124433 in C++ for GLI GODWIN BRAIN

Question

3. Write a program that computes the area of a circular region (the shaded area in the diagram) given the radius of the inner and the outer circles, ri and ro, respectively.






3. Write a program that computes the area of a circular region (the shaded area in the diagram) given the radius of the inner and the outer circles, ri and ro, respectively.

Answer 1

#include <iostream>
#include <cmath>
using namespace std;
int main()
{
	float r1;  // inner radius 
	float r2;  // outer radius
	float area; // area of the region
	cout << "Enter the inner radius of the circular region \n" ;
	cin >> r1 ;
	cout << "Enter the outer radius of the circular region \n" ;
	cin >> r2 ;
	if (r1 > r2)
	{
		cout << "Inner radius must be less than outer radius "<< endl;
	}  
	else
	{
		area = (M_PI)*(r2*r2 - r1*r1 );   // calculating the area of shaded region
		cout << "Area of the shaded region is " << area << " square unit " <<endl;    // printing area of the region
	}
	return 0;
}