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Following program shows you how to calculate triangle circumference.
This program gets triangle sides from user and calculates circumference and prints it using following formula
Circumference = side1 + side2 + side3

#include <iostream>
#include <math.h>

int main() {
    float triangleSide1;
    float triangleSide2;
    float triangleSide3;

    std::cout << "Enter the side1 of triangle:";
    std::cin >> triangleSide1;

    std::cout << "Enter the side2 of triangle:";
    std::cin >> triangleSide2;

    std::cout << "Enter the side3 of triangle:";
    std::cin >> triangleSide3;

    float circumferenceOfTriangle =
        triangleSide1 + triangleSide2 + triangleSide3;

    std::cout << "Circumference of triangle is: " << circumferenceOfTriangle;
}

Output:

Enter the side1 of triangle: 12
Enter the side2 of triangle: 15
Enter the side3 of triangle: 18
Circumference of triangle is: 45



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