Question

Find the area enclosed between two concentric circles of radii 2.8 centimetre and 1.2 CM.

Answer 1

area enclosed between two concentric circles is (area of bigger circle)-(area of smallar circle)
so,
area =A1-A2
=22/7×(2.8)^2-22/7×(1.2)^2
=24.64-4.52
=20.12sq.cm

Answer 2

The area enclosed between two concentric circles is 20.1142 sq.cm.

Step-by-step explanation:

Outer circle radius = 2.8 cm

Inner circle radius = 1.2 cm

Area enclosed between two concentric circles = Outer circle area - inner circle area

Area enclosed between two concentric circles = $\pi R^2 - \pi r^2$

Area enclosed between two concentric circles =$\frac{22}{7}(2.8^2-1.2^2)$

Area enclosed between two concentric circles = $20.1142 cm^2$

Hence The area enclosed between two concentric circles is 20.1142 sq.cm.

#Learn more:

Find the area enclosed between two concentric circles of radii 4 cm and 3 cm

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