Let's say that the sides of the poster are a and b. We know that the perimeter is 2a + 2b. We know that one side is 2 times width of the other side. So we can write it all as:
72 = 2a + 2 * 2a 72 = 2a + 4a 72 = 6a / ÷ 6 (both sides) a = 12
So one side is 12, the other one is 2 * 12 = 24 [inches]. It means that the area of the poster is 12 * 24 = 288 [square inches).
The area of Marshall's poster is 288 square inches, found by determining the width and length using the perimeter and the relationship between length and width. The width is 12 inches and the length is 24 inches. The area is calculated by multiplying these dimensions together.
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maaf kalau ada yang salah