Which circles have an area of 36pift2?
choose all answers that are correct.
a. a circle with a radius of 6 ft
b. a circle with a diameter of 6 ft
c. a circle with a radius of 12 ft
d. a circle with a diameter of 12 ft

Area=pi times radius^2
area=36pi
36pi=pi times radius^2
divide both sides by pi
36=radius^2
square root both sides
6=radius

2radius=diameter
2 times 6=12
radius=6
diamater=12

the answers area A and D
(if you know your radius and diameter, you would know that diameter is 2 times radius and you could eliminate 2 choices imedietly (B and C))

It is true that organism need food. but cells do not need food. the energy required by the cell for various chemical activities is released by mitochondria in the form of atp (adenosine triphosphate). atp is know as energy currency of the cell.hope it