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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Rectangle area easiest math for area: 5cm X 3cm = 15cm2
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1 method is to multiply length times the width and the 2 method is to divide the rectangle into triangles and find the area of one of the triangles and multiply the area by two.
To get the area you multiply the length and the width. Doing the math gives an answer of 150 square feet.