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Begin13. Two circles with the common center and radiuses $$R_1$$ and $$R_2$$ ($$R_1> R_2$$) are given. Find the areas of these circles $$S_1$$ and $$S_2$$, and also the area $$S_3$$ of a ring which outer radius is $$R_1$$, and the inner radius is $$R_2$$:
$$S_1 = \pi \cdot (R_1)^2, \quad S_2 = \pi \cdot (R_2)^2, \quad S_3 = S_1 - S_2.$$

Solution in Python 3:

import randomimport mathprint("Pi:", math.pi)R1 = random.randrange(2,10)R2 = random.randrange(1,R1)print("Radius 1: ", R1)print("Radius 2: ", R2)S1 = math.pi * R1**2S2 = math.pi * R2**2S3 = S1 - S2print("Area of the circle 1: ", S1)print("Area of the circle 2: ", S2)print("Area of the ring: ", S3)

Solution in C++:

#include<iostream>#include<cmath>using namespace std;int main(){	double r1,r2,s1,s2,s3,pi=3.14;	cout << "Enter the 1st radius: ";	cin >> r1;	cout << "Enter the 2nd radius: ";	cin >> r2;	s1 = pi*r1*r1;	s2 = pi*r2*r2;	s3 = abs(s1-s2);	cout << "Area of the circle 1: " << s1 << endl;	cout << "Area of the circle 2: " << s2 << endl;	cout << "Area of the ring: " << s3;	return 0;}