Question & Answers:

1. A circle has a radius of 5.2 inches, what is its circumference?

B. 32.656 in

Proof:

Formula for Circumference of Circle:

C = 2πr

where

C = Circumference

r = radius = 5.2 inches

π = 3.14

solving for C,

C = 2πr

C = (2) (3.14) (5.2)

C = 32.656 inches

2.If the radius of a circle is 18 cm, what is its diameter?

D. 36 cm

Proof:

Relationship of diameter and radius,

r = d/2

or

d = 2r

given r = 18, solve for d

d = 2r

d = 2(18)

d = 36 cm

* as always, double check my answers for errors or carelessness.

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Answer:

1.) B. 32.656 in

2.) D. 36 cm

Step-by-step explanation: