ANSWERS: (1) D = 2r
D = 2 x 6 inches
D = 12 inches
(2) C = 2 π r
C = 2 x 3.14 x 6 inches
C = 37.68 inches
REVIEW OF RADIUS, DIAMETER, AND CIRCUMFERENCE
Solve the following:
(1) What is the radius of a circle
if the diameter equals 15 inches?
(2) What is the radius of a circle
if the circumference equals 18.8499
inches? HINT: C = 2 π r (Solve for
r.)
(3) The radius of a circle = 10
feet. What is the circumference?
C = 2 π r
(4) The diameter of a circle 20
feet. What is the circumference?
C = π D
(5) If the radius = 15 feet, the
diameter must equal ___________ feet.
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