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

  1. Chapter 12 Class 10 Areas related to Circles
  2. Serial order wise
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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 2๐œ‹r = 18๐œ‹+38๐œ‹ 2๐œ‹r = 56 ๐œ‹ r = 56๐œ‹/2๐œ‹ r = 28 Hence, radius of new circle = r = 28 cm

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Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He provides courses for Mathematics from Class 9 to 12. You can ask questions here.
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