Question

Find the area of a ring lying between the circumference of two concentric circles, whose radius 10.5 cm and 7 cm.

Answer 1

Answer:

192.5cm^2

Step-by-step explanation:

Given :-

Radius of big circle is 10.5cm (R)

Radius of small circle is 7cm (r)

To find :-

Area of the ring between them

Formula :-

πR^2 - πr^2

Solution :-

= π(R^2-r^2)

= 22/7 { (10.5)^2 - (7)^2 }

= 22/7 { 110.25 - 49 }

= 22/7 { 61.25 }

= 22 × 8.75

= 192.5 cm^2

Answer 2

Step-by-step explanation:

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