CBSE Class 10 Maths (Basic) 2023 · Paper 430/5/1 · Question 33(b)

Areas Related to Circles 5 marks Hard

A B

and

C D

are arcs of two concentric circles of radii

3.5

cm and

10.5

cm respectively and centred at

O

. Find the area of the shaded region if

∠ A O B = 6 0^{\circ}

. Also, find the length of arc

C D

(Use π = \frac{22}{7})

Annular sector between two concentric arcs of radii 3.5 cm and 10.5 cm at angle 60 degrees

Answer

Shaded area

= \frac{154}{3} \approx 51.33

^{2}

and arc

C D = 11

cm.

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