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Question
The diameter of a semi-circular protractor is 21 cm. Its perimeter is ______.
Options
36 cm
54 cm
72 cm
108 cm
MCQ
Fill in the Blanks
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Solution
The diameter of a semi-circular protractor is 21 cm. Its perimeter is 54 cm.
Explanation:
Perimeter of a semicircle
= Curved arc + Diameter
= `1/2 xx π xx d + d`
With d = 21 cm and `π = 22/7`
Arc = `(22/7 × 21)/2`
= 33 cm
So, perimeter
= 33 + 21
= 54 cm
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