2007-09-14 05:02:25 · 6 answers · asked by missy73 1 in Science & Mathematics ➔ Mathematics
2 w + 2 l = Perimeter
2 * 6 + 2 L = 30
12 + 2L = 30
2L=18
L=9
2007-09-14 05:06:09 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Perimeter = 2 (length + width)
30 = 2 (L + 6)
30 = 2L + 12
2L = 30 - 12 = 18
L = 18 / 2 = 9 cm
L = 9 cm
2007-09-14 05:09:51 · answer #2 · answered by Swamy 7 · 0⤊ 0⤋
P = 2length + 2 width
30 - 6 - 6 = 18
so the 2 lengths = 18, half of 18 is 9
the length is 9
2(9) + 2(6) = 30
2007-09-14 05:09:50 · answer #3 · answered by sfroggy5 6 · 0⤊ 0⤋
We know there are four sides, and two sides are width, and two are lenght, so we can always use the formula 2l+2w=p. So now we can plug in:
2l + 2w = p
2l + 2(6) = 30
2l + 12 = 30
Now we can solve for l:
2l + 12 = 30
2l + 12 -12= 30 - 12. Remmber whatever you do to one side you must do to the other.
2l= 18
2l/2= 18/2
l = 9
The answer is 9 centimeters.
I hope that has helped.
2007-09-14 05:26:18 · answer #4 · answered by MelMel 2 · 0⤊ 0⤋
Perimeter Formula
P = 2L + 2W
30 + 2L = 2(6)
30 = 2L + 12
Transpose 12
30 - 12 = 2L + 12 - 12
Colllect like terms
18 = 2L
Divide both sides of the equation by 2
18 / 2 = 2L / 2
18 / 2 = L
9 = L
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The length is 9 centimeters.
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2007-09-14 05:10:14 · answer #5 · answered by SAMUEL D 7 · 0⤊ 0⤋
this is basic geometry. Assuming you are discussing a rectangle: 2L+2W=P. I'm going to make you do the algebra.
2007-09-14 05:07:30 · answer #6 · answered by climberaxe 5 · 0⤊ 0⤋