Help writing rock, paper, scissors game

I'm completely new and unfamiliar with programming, but I need to write a python program with modules that displays a menu:
Geometry Calculator
1. Area of a circle
2. Area of a rectangle
3. Area of a triangle
4. Exit program
if 1 (area of circle) is selected, the program should ask for the radius of the circle & then calculate the area (using the formula area = pi*r^2) and display the result, same for the other options but for their respective shapes, and end the program if the number 4 is entered.

Please read the sticky post.

You have any code?
Please be more specific about what you need help and start with the basic first, e.g. learn how to get user input.

The triangle is a little interesting, there being so many ways to represent a triangle.

I quibble with your circle area formula.