Knowing the length and the width.
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the area of a triangle is base times height times one half and rectangle is length times width
Squares are rectangles so the formula for area will stay the same.
in finding the area if a square or rectangle multiply the length and width, for a triangle, multiply length and width divided by two.
It is base times perpendicular height.
the two dimensions that are multiplied are the top long layer and one of the sides to figure out your area of your rectangle and square