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Ex 11.3, 7 - Chapter 11 Class 7 Perimeter and Area
Last updated at Dec. 12, 2018 by Teachoo
Ex 11.3
Ex 11.3, 1 (a)
Ex 11.3, 1 (b) Important
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Ex 11.3, 2 (c)
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Ex 11.3, 7 Important You are here
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Transcript
Ex 11.3, 7 Find the perimeter of the adjoining figure, which is a semicircle including its diameter. Diameter = AB = 10 cm Radius = r = 𝐷𝑖𝑎𝑚𝑒𝑡𝑒𝑟/2 = 10/2 = 5 cm Perimeter of semicircle = Length of semicircle part + Length of AB = 1/2 × 2𝜋r + 2r = 𝜋r + 2r = 3.14 × 5 + 2 × 5 = 314/100 × 5 + 10 = 314/20 + 10 = 157/10 + 10 = 15.7 + 10 = 15.7 + 10 = 25.7 cm ∴ Perimeter is 25.7 cm
