waecmaths question:
Two circles have radii 16cm and 23cm. What is the difference between their circumferences? (take $\pi =\tfrac{22}{7}$)
Option A:
244.92cm
Option B:
149.92cm
Option C:
44.00cm
Option D:
43.96cm
waecmaths solution:
Circumference of a circle is given by 2πr
The difference between the two circumferences of the circle will be
$2\pi {{r}_{2}}-2\pi {{r}_{1}}=2\pi ({{r}_{2}}-{{r}_{1}})=2\times \tfrac{22}{7}(23-16)cm=2\times \tfrac{22}{7}\times 7cm=44cm$
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