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What is the smallest perimeter possible for a rectangle whose area is 16 in2, and what

are its dimensions?

User Boude
by
8.3k points

1 Answer

3 votes
a = 4,


we denote one side of the rectangle with
a
, and the other with
b
we can write, that:
a

b
=
16

so we can write, that
b
=
16
a
Now we can write perimeter
P
as a function of
a
P
=
2

(
a
+
16
a
)
We are looking for the smallest perimeter, so we have to calculate derivative:
P
(
a
)
=
2
a
+
32
a
P
'
(
a
)
=
2
+
(

32
a
2
)
P
'
(
a
)
=
2

32
a
2
=
2
a
2

32
a
2
The extreme values can only be found in points where
P
'
(
a
)
=
0
P
'
(
a
)
=
0

2
a
2

32
=
0
2
a
2

32
=
0

x
a
2

16
=
0

×
x
.
.
a
2
=
16

×
×
x
a
=

4
or
a
=
4
Since, length is a scalar quantity, therefore, it cannot be negative,
When
a
=
4
,
b
=
16
4

b
=
4
User Wolfgang Blessen
by
7.9k points

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