Question

The area of a circle is 36cm^2 (2 is the exponent)

(a) find the radius of the circle

(b) find the circumference of a circle

Answer 1

a) 3.39 cm b) 21.29 cm

Explanation:

ok so the area of a circle is
`\pi`r^2.

if the area is 36 cm^2 we can divide it by 3.14, which is pi (
`\pi`). that gives us 11.46. now we find the approximate square root of this.
`√(11.46)`

this is approximately equal to 3.39. the radius is about 3.39cm.

now that we know the radius, we can easily find the circumference. the formula for this is
`\pi`d. the diameter is just the radius times 2. (3.39)(2)

we plug the numbers into the formula: 3.14(6.78)=21.29 cm =d