Example 11 - Chapter 9 Class 7 Perimeter and Area

Last updated at April 16, 2024 by

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Transcript

Example 11 Sudhanshu divides a circular disc of radius 7 cm in two equal parts. What is the perimeter of each semicircular shape disc? (Use π = 22/7)Now, Perimeter of semicircle = Length of semicircle part + Length of AB Length of semicircle part Radius = r = 7 cm Length of semicircle part = 1/2 × Circumference of circle = 𝟏/𝟐 × 2𝜋r = 𝜋 r = 22/7 × 7 = 22 cm Length of AB AB = 2 × Radius = 2 × 7 = 14 cm Thus, Perimeter of semicircle = Length of semicircle part + Length of AB = 22 + 14 = 36 cm ∴ Perimeter is 36 cm

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.