Question: What is the circumference of a circle with diameter 21 inches? [Use π = 3.14.]


A ) 72.94 inches
B ) 131.88 inches
C ) 75.94 inches
D ) 65.94 inches

Steps to derive

1 The diameter of the circle is 21 inches.

2 The circumference of a circle = π x diameter.

3 The circumference of the circle = 3.14 x 21
 [Substitute π = 3.14 and diameter = 21 inches.]

4 = 65.94 inches

5 The circumference of the circle is 65.94 inches.



Hence the right answer is Option D

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