The radius or diameter is given. Find the missing measures to the nearest hundredth.
14. r = 8 cm
d=
C=
15. d = 9 m

r=
С=

For any circle of radius r

The diameter of the circle = two times of the radius = 2r

And The Circumference= C = 2πr

14. If r = 8

So, d = 2r = 2 * 8 = 16 cm

C = 2πr = 2 * π * 8 = 50.27 cm (to the nearest hundredth.)

15. If d = 9 m

So, d = 2r

∴ r = d/2 = 9/2 = 4.5 m

And C = 2πr = 2 * π * 4.5 = 28.27 m (to the nearest hundredth.)

The circle is centered at (-8,3) and has a diameter of 20.

Step-by-step explanation:

The radius is 10 because you would take the square root of 100. To find the diameter you would multiply the radius by 2.