Question

find the circumference of a circle whose diameter is 91 cm
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Answer 1

Question:

If diameter of a circle is 91 cm, find its circumference.

Solution:

Diameter= 91 cm

radius= 91/2= 45.5 cm

Circumference= 2πr

$2\pi \times r \\ = 2 \times \frac{22}{7} \times 45.5 \\ = 2 \times \frac{22}{7} \times \frac{455}{10} \\ = \frac{20020}{70} \\ = 286 \: cm$

Answer:

Circumference= 286 cm.