Ex 11.1, 10 - Chapter 11 Class 10 Areas related to Circles

Last updated at August 17, 2026 by

Ex 11.1, 10 - An umbrella has 8 ribs which are equally spaced - Ex 11.1

part 2 - Ex 11.1, 10 - Ex 11.1 - Serial order wise - Chapter 11 Class 10 Areas related to Circles

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Transcript

Ex 11.1, 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 = ๐Ÿ/๐Ÿ–ร— Area of umbrella Radius = r = 45 cm Area of umbrella = Area of circle = ๐œ‹๐‘Ÿ2 = ๐… (45)2 = 22/7ร— "45 "ร— 45 = 22/7ร— 2055 Now, Area of rib = 1/8ร— area of umbrella = ๐Ÿ/๐Ÿ–ร—๐Ÿ๐Ÿ/๐Ÿ•ร— 2025 = (11 ร— 2025)/(4 ร— 7) = ๐Ÿ๐Ÿ๐Ÿ๐Ÿ•๐Ÿ“/๐Ÿ๐Ÿ– cm2 Hence, Area between two consecutive rib = 22275/28 cm2

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