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Ex 12.1, 1 - The radii of two circles are 19 cm and 9 cm - Ex 12.1

Ex 12.1, 1 - Chapter 12 Class 10 Areas related to Circles - Part 2


Transcript

Ex 12.1, 1 The radii of two circles are 19 cm and 9 cm respectively. Find the radius of the circle which has circumference equal to the sum of the circumferences of the two circles. Given that, Radius of 1st circle = r1 = 9 cm Radius of 2nd circle = r2 = 19 cm Let the radius of required circle = r cm According to question, Circumference of required circle = Sum of circumference of two circles Now, Circumference of required circle = Sum of circumference of two circles 2𝜋r = 18𝜋+38𝜋 2𝜋r = 56 𝜋 r = 56𝜋/2𝜋 r = 28 Hence, radius of new circle = r = 28 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 12 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.