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Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class


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Ex 9.2, 12 The circumference of a circle is 31.4 cm. Find the radius and the area of the circle? (Take Ο€ = 3.14) Radius = r = ? Given, Circumference = 31.4 cm 2πœ‹r = 31.4 2 Γ— 3.14 Γ— r = 31.4 r = (πŸ‘πŸ.πŸ’)/(𝟐 Γ— πŸ‘.πŸπŸ’) r = 314/10 Γ— 100/(2 Γ— 314) r = 1/10 Γ— 100/(2 Γ— 1) r = 10/2 r = 5 cm Now, Area of circle = πœ‹r2 = 3.14 (5)2 = 3.14 Γ— 25 = πŸ‘πŸπŸ’/𝟏𝟎𝟎 Γ— 25 = 314/4 = 157/2 = 78.5 cm2 ∴ Radius of circle is 5 cm & it’s area is 78.5 cm2

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.