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The perimeter is the sum of all four sides, so you need to calculate 2 x length + 2 x height. The fact that the rectangle is at the bottom of a triangle is irrelevant - except that in specific diagrams, information may be provided that lets you calculate the length or the width of the triangle.
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Earn +20 ptsQ: What is the perimeter of rectangle 3mx6m on the bottom of a triangle?
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