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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