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Question

A public park, in the form of a square, has an area of (100±0.2)m2 .The side of park is :

A
(10±0.01)m
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B
(10±0.1)m
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C
(10±0.02)m
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D
(10±0.2)m
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Solution

The correct option is A (10±0.01)m

Let the side length of the square park is l.

The area of a square is given as,

A=l2

100=l2

l=10m

The error in length is given as,

ΔAA=2Δll

0.2100=2Δl10

Δl=0.01m

Thus, the side of the park is (10±0.01)m.


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