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Shubhanshu Sen

· started a discussion

· 1 Months ago

discribe me (Question: 187412.0 )

how is solved this
plzz discribe

Question:
The area of the ring between two concentric circles, whose circumference are 88 cm and 132 cm is –
Options:
A) 780 cm2
B) 770 cm2
C) 715 cm2
D) 660 cm2
Solution:

Ans: (B)


Knowledge Expert

· commented

· 1 Months ago

Points to be Remember:

1. concentric circles means both circles have the same center.

2. Circumference of the circle = 2 pi r

find the radius of both the rings by applying circumference formula.

then apply formula:

Required area = pi (greater radius)^2 - pi (smaller radius)^2
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