If the diameter of a protracter is 21cm,then find its perimeter.
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= 32.97cm; ans.
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perimeter of a circle = 2πr
radius = diameter/2 = 21/2
= 10.5 cm
2πr
= 2 × 22/7 × 10.5
= 462/7
= 66
half of a circle
66/2 = 33 cm
answer = 33 cm
The diameter of a protracter is 21cm is 33 cm.
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