CBSE Class 10 Maths (Standard) 2016 · Paper 30/2 · Question 16

Areas Related to Circles 3 marks Medium

In Fig. 6, find the area of the shaded region, enclosed between two concentric circles of radii

7

cm and

14

cm where

∠ A O C = 4 0^{\circ}

. (Use

π = \frac{22}{7}

)

Annular region between two concentric circles with a 40-degree sector removed.

Answer

The shaded area is

\frac{3696}{9} = 410 \frac{2}{3} \approx 410.67

^{2}

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