Question

If the area of a circle is 324 cm, find:
Its circumference in terms of pi

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Answer 1

20.3π cm

Explanation:

Area of a circle = 324 square cm

πr² = 324

`(22)/(7)*r^(2)= 324\\\\ r^(2) = (324*7)/(22)\\\\ r^(2)= 103.09\\\\ r =√(103.09)\\\\`

r = 10.15 cm

Circumference = 2πr

= 2 * π * 10.15

= 20.3π cm