CBSE Class 10 Maths (Standard) 2017 · Paper 30/2 · Question 12

Areas Related to Circles 3 marks Medium

In the given figure, two concentric circles with centre

O

have radii

21

cm and

42

cm. If

∠ A O B = 6 0^{\circ}

, find the area of the shaded region.

[Use π = \frac{22}{7}]

Two concentric circles with a 60° sector marked; the shaded part is the annulus outside the sector.

Answer

Area of the shaded region

= 3465

^{2}

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