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Standard VI
Mathematics
Unitary Method
Question
The temperature of a metal coin is increased ny
100
0
C and its diameter by 0.15%. Its area increases by nearly
0.15%
0.30%
0.60%
0.0225%
A
0.15%
B
0.0225%
C
0.30%
D
0.60%
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Solution
Verified by Toppr
A
=
π
r
2
Δ
A
A
=
2
Δ
A
r
Δ
A
A
%
=
2
(
Δ
A
r
)
×
100
Δ
A
A
%
=
2
×
0.15
=
0.30
%
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