CBSE Class 10 Maths (Basic) 2020 · Paper 430/2/1 · Question 17

Areas Related to Circles 1 mark Medium

In figure-2

P Q ⌢

and

A B ⌢

are two arcs of concentric circles of radii 7 cm and 3.5 cm resp., with centre O. If

∠ P O Q = 3 0^{\circ}

, then find the area of shaded region.

Fig. 2: Annular sector between concentric arcs of radii 7 cm and 3.5 cm, angle 30°.

Answer

Area of the shaded region

= 9.625

^{2}

(= \frac{77}{8} cm^{2})

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