1. Find the circumference of the circles with the following radius: (Take t =
22
23 꼭
(a) 14 cm
(b) 28 mm
(c) 21 cm
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Answer:
Take symbol of pie as €.
circumference of circle with radius 14 cm
= 2€r
=2(22/7)(14)
=2×22×2
=88 cm
circumference of circle with radius 28 mm
=2€r
=2(22/7)(28)
=2×22×4
=176
circumference of circle with radius 21 cm
=2€r
=2(22/7)(21)
=2×22×3
=114.
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