# Math

The perimeter of the rectangle is 120 units what is its area in square units
L=3n
W= n

What formula do I use?

A) 675
B) 900
C) 1225
D) 2700

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1. Perimeter is the sum of all sides. For a rectangle, P = 120 = 2L + 2W.

You are given that
L = 3n
W = n,
so you can now do a substitution into the perimeter equation:
120 = 2(3n) + 2(n).

Simplifying this, we get 120 = 8n, so n = 15.

Revisiting our length and width equations,
L = 3(15) = 45
W = 15

Area is length * width, which is A) 675 units.

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posted by Alex

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