Question

find the radius of a bicycle wheel whose circumference is 198cm

Answer 1

Circumference of a circle = 2 pi r
= 2×22/7×r = 198
= r = 198×7/2×22
= 31.5cm


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Answer 2

Circumference of a circle= 2πr
$= > 198 = 2\pi r \\ = > r = \frac{198}{2\pi} \\ = \frac{198}{2 \times \frac{22}{7} } \\ = \frac{198 \times 7}{44} \\ = 4.5 \times 7 \\ = 31.5 \\ as \: all \: the \: units \: are \: cm \\ so \: answer \: is \: 31.5cm$
I HOPE IT HELPS...!!!