Question

The diameter of a circular well is
4.2m. what is its circumference?​

Answer 1

Circumference of a circle = 2πr

d=4.2 m

r=4.2/2

r=2.1 m

circumference=2 x 22/7 x 2.1

= 2 x 22 x 0.3

= 44 x 0.3

=13.2 m

Answer 2

Answer:

$diameter = 4.2m \\ radius = \frac{d}{2} = \frac{4.2}{2} = 2.1m \\ circumference = 2\pi \: r \\ = 2 \times \frac{22}{7} \times \frac{21}{10} = \frac{66}{5} = 13.2m$

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