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The perimeter of a semicircular protractor whose radius is ‘r’ is

(a) π + 2r   (b) π + r   (c) πr   (d) πr + 2r

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Question 21 The perimeter of a semicircular protractor whose radius is ‘r’ is (a) π + 2r (b) π + r (c) πr (d) πr + 2r Perimeter of semicircle = Circumference of semicircle + Diameter AB = 𝟏/𝟐 × 2𝜋r + 2r = 𝜋r + 2r So, the correct answer is (d)

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Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths and Science at Teachoo.