using System;
class Program
{
static void Main() {
float opposite = 2.5f;
float hypotenuse = 5f;
double angle_sin = opposite / hypotenuse;
double right_triangle_angle = Math.Asin(angle_sin) * 180 / Math.PI;
Console.Write("Right Triangle Angle = " + right_triangle_angle);
}
}
/*
run:
Right Triangle Angle = 30
*/