What is the area of the watered region (in terms of 𝝅)? - CBSE Class 1 - CBSE Class 10 Sample Paper for 2026 Boards - Maths Basic

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Question 37 (ii) What is the area of the watered region (in terms of 𝝅)?Radius (r) = 21 m And, 𝜽=𝟖𝟎° Area of watered region = Area of sector with angle 80° = 𝜃/(360°)× 𝜋𝑟2 = (𝟖𝟎°)/(𝟑𝟔𝟎° )× 𝝅 × (𝟐𝟏)𝟐 = 8/36× 𝜋 × 441 = 2/9× 𝜋 × 441 = 2 × 𝜋 × 49 = 98𝝅 m2

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