Question

Find the circumference and the area of a circle with radius 4 cm

Please help!

Answer 1

Circumference: 8πcm

Area: 16πcm²

Explanation:

Circumference:

To find the circumference of a circle, use the formula c = 2πr, where r is the radius. Use 3.14 for pi.

r = 4

c = 2πr

c = 2(3.14)r

c = 2(3.14)4

c = 25.12cm

Area: To find the area of a circle, use the formula πr², where r is the radius. Use 3.14 for pi.

r = 4

a = πr²

a = (3.14)r²

a = (3.14)4²

a = (3.14)16cm²

a = 50.24 cm²

Answer 2

Circumference: 2 * pi * r
pi = 3.14, r = 4
2 * 3.14 * 4 = 25.12
Circumference: 25.12 cm

Area = pi * r^2
pi = 3.14, r = 4
3.14 * 4^2 = 50.24
Area: 50.24 cm^2