If the perimeter of a semi-circular protractor is 36 cm.

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asked Mar 15 in Class X Maths by aditya23 (-605 points)

If the perimeter of a semi-circular protractor is 36 cm. Find its diameter.

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1 Answer

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answered Mar 15 by navnit40 (-2,750 points)

Let r be the radius of the protractor, then

Perimeter = πr + 2r

According to the question,

36 = πr + 2r

⇒  36 = r(22/7 + 2)

⇒   r = 7 cm.

∴  The diameter of the protractor is (2 × 7) cm = 14 cm.

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