Find all angles of a triangle in 3D | CPP program for finding all angles of a triangle ; function for finding the angle ; Driver code
#include <bits/stdc++.h> NEW_LINE #include <cmath> NEW_LINE using namespace std ; float angle_triangle ( int x1 , int x2 , int x3 , int y1 , int y2 , int y3 , int z1 , int z2 , int z3 ) { int num = ( x2 - x1 ) * ( x3 - x1 ) + ( y2 - y1 ) * ( y3 - y1 ) + ( z2 - z1 ) * ( z3 - z1 ) ; float den = sqrt ( pow ( ( x2 - x1 ) , 2 ) + pow ( ( y2 - y1 ) , 2 ) + pow ( ( z2 - z1 ) , 2 ) ) * sqrt ( pow ( ( x3 - x1 ) , 2 ) + pow ( ( y3 - y1 ) , 2 ) + pow ( ( z3 - z1 ) , 2 ) ) ; float angle = acos ( num / den ) * ( 180.0 / 3.141592653589793238463 ) ; return angle ; } int main ( ) { int x1 = -1 ; int y1 = 3 ; int z1 = 2 ; int x2 = 2 ; int y2 = 3 ; int z2 = 5 ; int x3 = 3 ; int y3 = 5 ; int z3 = -2 ; float angle_A = angle_triangle ( x1 , x2 , x3 , y1 , y2 , y3 , z1 , z2 , z3 ) ; float angle_B = angle_triangle ( x2 , x3 , x1 , y2 , y3 , y1 , z2 , z3 , z1 ) ; float angle_C = angle_triangle ( x3 , x2 , x1 , y3 , y2 , y1 , z3 , z2 , z1 ) ; cout << " Angles ▁ are ▁ : " << endl ; cout << setprecision ( 3 ) ; cout << " angle ▁ A ▁ = ▁ " << angle_A << " ▁ degree " << endl ; cout << " angle ▁ B ▁ = ▁ " << angle_B << " ▁ degree " << endl ; cout << " angle ▁ C ▁ = ▁ " << angle_C << " ▁ degree " << endl ; }