# Chapter 1.2: C# Intro

# 3 Days in a Row, Let’s Go!

**Another Challenge: **Prompt for an angle and return the cosine of that angle.

using System;

namespace Challenge{

class Program{

static void Main(string[] args){

// prompt for and get angle

Console.Write("Enter angle in degrees: ");

float angle = float.Parse(Console.ReadLine());// calculate and print cosine and sine

angle *= (float)Math.PI / 180;

Console.WriteLine("Cosine: " + Math.Cos(angle));

Console.WriteLine("Sine: " + Math.Sin(angle));

Console.WriteLine();

}}}

This challenge requires designing a console app that can take user input and respond with the appropriate output (and also some Math, no pun intended). The System namespace has the `Console.ReadLine()`

function for doing just this. Finally, need to use the `Math`

library to use PI.