Question

attached question, answerer(s) get medals!

Answer 1

a

Answer 2

area of a circle: \[A=\pi*r^2\]

Answer 3

general form of circle is x^2 +y^2 = r^2

area of circle = pi r^2

Answer 4

Area = pi r^2, r^2 =64 so
Area = pi 64 = 64pi A

Answer 5

Sorry that A at the end must not be there..

Answer 6

64pi

Answer 7

i think i will hav to how to figure out these types of problems.

Answer 8

Please do saifoo, you're epic.

Answer 9

lol.

Answer 10

thnks! ^.^