Most of us use formulas to determine the area of common polygons, such as triangles and rectangles. The formula for the area of a rectangle is A = l w, where l represents the length of the rectangle and w represents the width.
The formula, for the area of a triangle is where b represents the length of the base of the triangle and h represents the height of the triangle. (Height is the length of the segment from a vertex perpendicular to the opposite side.)
Explain how the formulas below relate to using the geoboard to find an area:
Rectangle: A = l w
Right triangle: A =
Think about the rectangle method you used on the geoboard to find the area of a right triangle. Close Tip