math
posted by jr on .
How long is the side of a square picture that can fit inside a circular picture frame that has a diameter of 8 inches?
Hint: Pythagorean Theorem

a^2 + b^2 = c^2
a^2 + a ^2 = 8^2
2a^2 = 64
a^2 = 64/2
a^2 = 32
a = 5.6569 
Find the circumference of a circle with a radius of 2.1cm.(Use 3.14 for pi.)