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IBPS RRB Office Assistant 2018 Paper
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© examsnet.com
Question : 45
Total: 80
The circumference of a circle is 66 m. Find the approximate area of square if the radius of circle is two times of the side of a square.
18
cm
2
32
cm
2
25
cm
2
36
cm
2
28
cm
2
Validate
Solution:
Given, circumference of circle = 66 cm
2πr = 66 (where r is the radius of circle)
⇒
2
×
22
7
×
r
=
66
⇒
r
=
66
×
7
2
×
22
⇒
r
=
21
2
cm
According to the question,
Radius of circle = 2 x side of square
21
2
=
2
×
side of square
∴ Side of square
=
21
4
cm
Hence, area of square
=
(
side
)
2
=
(
21
4
)
2
=
441
16
=
27.5625
=
28
cm
2
© examsnet.com
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