Im working on "Finding the Area and Circumference of a circle" I have a question. Is the circumference half of the area? I was looking at my brothers math book, this is what it shows.

Question

C=πr2≈ 2(3.14)(4)≈ 25.1

A=πr^2≈ 3.14(4^2)≈ 50.2 cm^2.

Thanks.

Answer 1

No.

http://www.mathsisfun.com/geometry/circle.html

Answer 2

That was a coincidence and only happens when r = 4

When r = 2, the area and the circumference just happen to be equal, again a coincidence.

Answer 3

Okay thank you. :) I knew it didn't seem right, but my dad wanted me to check it out.