Friday, July 11, 2014

The area of a rectangle is 15 square centimeters and the perimeter is 16 square centimeters. What are the dimensions of the rectangle?

Given that the area of the rectangle is 15
cm^2.


Also, given that the perimeter is 16
cm^2


We need to find the length of the
sides.


==> Let the sides be L and
w.


==> L*W = 15
...........(1)


==> 2L + 2W =
16


We will divide by
2.


==> L + W = 8
..............(2)


We will use the substitution method to
solve.


==> L = 8-
w


==> (8-W) * W =
15


==> 8W - W^2 =
15


==> W^2 - 8W +15 =
0


==> (w-3)(W-5) =
0


==> W1= 3 ==> L1=
5


==> W2 = 5 ==> L2 =
3


But the length must be greater than the
width.


Then, the length is 5 and the width is
3.

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