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Standard V
Mathematics
Question
The radius of a roller is 0.7 m and it is 2 m long How much area will it cover in 10 revolutions?
88
m
2
78
m
2
80
m
2
70
m
2
A
70
m
2
B
88
m
2
C
80
m
2
D
78
m
2
Open in App
Solution
Verified by Toppr
The correct option is
A
88
m
2
For one revolution
Curved surface area=
2
π
r
h
=
2
×
22
7
×
7
10
For 10 revolutions
Curved surface area=
2
×
22
×
2
10
×
10
=
88
m
2
'
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