Q26.
a) Find the circumference of a circle whose radius is 3.5cm.
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solution:
circumference of a circle =2×pi× r
radius =3.5cm
pi=22/7
put the value of pi and radius
=2×22/7×3.5
=2×22/7×35/10
=2×22×5/10
=2×22×1/2
answer:22
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