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The term "rectangle method" is used in different ways in math, but I will guess that your question is related to finding areas on a Geoboard.

A Geoboard has a grid of pegs; you can make outlines of figures by stretching elastic bands around the pegs. If your figure is a triangle, you can find it's area by making the smallest rectangle which will enclose the triangle (The rectangle should have vertical and horizontal sides). The area of the rectangle can be found easily by multiplying the length by the width. The area of the triangle is half of the area of the rectangle.

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12y ago

What else can I help you with?