Q.

What is the area of the circular ring included between two concentric circles of radius 14 cm and 10.5 cm.


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a

 150 cm2

b

188cm2

c

248 cm2

d

269.5cm2 

answer is D.

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Detailed Solution

Concept- Finding the area of circular ring by using the formula of area of circle
Area of circle= πr2
Given: radius = 14 cm, 10.5 cm
Area of the bigger circle =  π 142
= π×14×14
=196π cm2
Area of smaller circle ,  πr2
=π 10.52
=110. 25 cm2
Question ImageThe shaded region,
Area of circle = 196π – 110.25π 
=85.75×227
=269.5 cm2
Hence, the correct option is 4.
 
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