Question

11. Area of shaded portion is (in sq.cm)

5 cm 1 cm 3 cm

O 25
O 15
O 14
O 10

Answer 1

Answer:

Let the radius of the circle be r.

Now,

Circumference = Diameter + 45

⇒2πr=2r+45⇒2πr-2r=45⇒2r(227-1)=45⇒2r×157=45⇒r=10.5 cm

∴ Circumference = Diameter + 45 = 2(10.5) + 45 = 66 cm

Hence, the circumference of the circle is 66 cm.