#include <stdio.h>
#include <math.h>
int main(void)
{
int a_base = 3, b_left_side = 4, c_right_side = 5;
float perimeter = a_base + b_left_side + c_right_side;
printf("Perimeter = %.2f\n", perimeter);
float semi_perimeter = (a_base + b_left_side + c_right_side) / 2;
double area_triangle1 = sqrt(semi_perimeter * (semi_perimeter - a_base) *
(semi_perimeter - b_left_side) *
(semi_perimeter - c_right_side));
printf("Area triangle1 = %.2f\n", area_triangle1);
int b_base = 4, a_right_side = 6, angle_ab = 55;
double area_triangle2 = (a_right_side * b_base *
sin((M_PI / 180) *
angle_ab)) / 2;
printf("Area triangle2 = %.2f\n", area_triangle2);
int height = 5;
b_base = 8;
double area_triangle3 = (b_base * height) / 2;
printf("Area triangle3 = %.2f\n", area_triangle3);
return 0;
}
/*
run:
Perimeter = 12.00
Area triangle1 = 6.00
Area triangle2 = 9.83
Area triangle3 = 20.00
*/
