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Ex 12.2, 10 - An umbrella has 8 ribs which are equally spaced - Ex 12.2

  1. Chapter 12 Class 10 Areas related to Circles
  2. Serial order wise
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Ex 12.2, 10 An umbrella has 8 ribs which are equally spaced (see figure). Assuming umbrella to be a flat circle of radius 45 cm, find the area between the two consecutive ribs of the umbrella. Area of rib = 1/8× Area of umbrella Radius = r = 45 cm Area of umbrella = Area of circle = 𝜋𝑟2 = 𝜋 (45)2 = 22/7×"45"× 45 = 22/7× 2055 Area of rib = 1/8× area of umbrella = 1/8×22/7× 2025 = (11 × 2025)/(4 × 7) = 22275/28 cm2 Hence, Area between two consecutive rib = 22275/28 cm2

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