SOLUTIONS TO CIRCLE PROBLEMS

(1) C = π D or C = 2 π r

(2) A = π r2

(3) 1/2 diameter

(4) 2 radii

(5) radius = diameter R = 6.248 = 3.124 inches

2

2

(6) A = π r2

= 3.14 x 102

= 3.14 x 100

A = 314 square feet

(7) C = π x D

= 3.14 x 20 feet

C = 62.8 feet

(8) C = 235.52 feet

C = π D

r = _D_

so

2

D = _C_

r = _75_

π

D = 235.52

2

3.14

r = 37.5 feet

D = 75 feet

You should now be able to solve these problems without difficulty.

If you were able to answer all of the questions correctly, turn to page 31.

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