The perimeter of a rectangle is 42 cm. One side is 9 cm longer than the other side. Find the lengths of the sides.

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asked Nov 19, 2018 157k views

1 Answer

Edelcom · Answer 1 · 2018-11-25T02:02:10+0000

P=2(L+W)
P=42
42=2(L+W)
21=L+W

one side is 9 longer than other
L=9+W
subsitute

21=L+W
21=9+W+W
21=9+2W
minus 9 both sides
12=2W
divide by 2 both sides
6=W

sub back

L=9+W
L=9+6
L=15

the sides are lenght 15cm and 6cm

The perimeter of a rectangle is 42 cm. One side is 9 cm longer than the other side. Find the lengths of the sides.

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