Q. 26 E4.9( 7 Votes )

The inner diameter and external diameter of an Iron ring plate are 20 cm and 22 cm. The quality of iron plate in the ring is
A. 22 sq.cm.

B. 44 sq.cm.

C. 66 sq.cm.

D. 88 sq.cm.

Answer :


Given: Inner diameter = 20 cm


Outer diameter = 22 cm


Inner radius = 10 cm and outer radius = 11 cm


Area of such concentric circles = Area of the larger circle – area of the smaller circle


The area of a circle = πr2


Area of the iron plate = πR2 - πr2


Area of the iron plate


Area of the iron plate


Area of the iron plate


Area of the iron plate


Area of the iron plate = 22× 3 = 66cm2

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