Question

(Part A)Find the area of the circle with a radius of 4m.

(Part B)Find the circumference of the circle with a radius of 4 m.

Answer 1

Part A: 16π m²

Part B: 8π m

Explanation:

Part A

`A=\pi r^2` where r is the radius

Plug in 4 as the radius

`A=\pi (4)^2\\A=\pi(16)\\A=16\pi`

Therefore, the area of the circle is 16π m².

Part B

`C=2\pi r` where r is the radius

Plug in 4 as the radius

`C=2\pi (4)\\C=8\pi`

Therefore, the circumference of the circle is 8π m.

I hope this helps!

Answer 2

Explanation:

Part A)

Area of Circle =

`\pi {r}^(2) \\ = \pi( {4}^(2) ) \\ = 16\pi {m}^(2)`

Part B)

Circumference of Circle =

`2\pi \: r \\ = 2\pi(4) \\ = 8\pi \: m`