Math pi work?

Question

Could anyone help me with this?
pi = 3.14 with this no more than 2 decimal places.
http://img229.imageshack.us/img229/2201/homework001hr9.jpg

thank you

only use numbers with 2 decimal places, if you have like 42.516215
just round 42.52

Answer 1

First problem:

1. Use the area of each cicrle to find the radius.
Hint: A = 2 * pi * radius^2

Solve for r

2. Once you know the radius, you know the length of each side of the triangle. And you are given the height of the triangle.

A = 1/2 * b * h (where b = 2*r from above)

Second Problem:
Very similar to the first.
1. Use the area of each cicrle to find the radius.
Hint: A = 2 * pi * radius^2
Solve for r

2. Area of a square is the lenght of one side times itself.
Using r from above, the area is

A = (2r)^2