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Byju's Answer
Standard VIII
Mathematics
Introduction to Surds
Determine the...
Question
Determine the side of a square whose area is
4
√
125
unit
2
.
A
2
(
5
√
5
)
unit
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B
2
(
5
√
5
)
1
2
unit
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C
5
(
5
√
5
)
1
2
unit
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D
2
(
5
√
5
)
1
2
unit
2
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Solution
The correct option is
B
2
(
5
√
5
)
1
2
unit
Let the side of a square be
′
a
′
.
We know, Area
=
a
×
a
⇒
4
√
125
=
a
2
(taking square root of both side of the equation)
⇒
(
4
√
125
)
1
2
=
(
a
2
)
1
2
⇒
(
4
)
1
2
×
(
√
5
×
5
×
5
)
1
2
=
a
2
×
1
2
⇒
a
=
2
(
5
√
5
)
1
2
∴
Side of the square is
2
(
5
√
5
)
1
2
unit
.
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