### Problem: area of figures

Write a program that inputs the sizes of a geometric figure and calculates its face. The figures are four types: square, rectangle, circle and triangle.

The first line of the entrance reads the type of the figure (square, rectangle, circle, triangle).

• If the figure is square, the next row reads one number - the length of its side.
• If the figure is a rectangle, on the next two rows we read two numbers - the lengths of its sides.
• If the figure is circle, the next row reads one number - the radius of the circle.
• If the figure is triangle, on the next two rows we read two numbers - the length of the side and the length of its height.

Round the result up to the third digit after the decimal point.

Input Output
square
5
25
rectangle
7
2.5
17.5
circle
6
113.097
triangle
4.5
20
45

#### Testing in the Judge System

Test your solution from the example here: https://judge.softuni.bg/Contests/Practice/Index/506#12.