Area of Trapezoid Small 320×175 Medium 640×351 Large 1024×561 Download Tiff Original 2400×1315 | (128.9 KB) Description "The student sees the trapezoid is equal in area to a rectangle whose base is the average base of the trapezoid, and whose altitude is the same as that of the trapezoid." -Foster, 1921 Keywords comparison, cut and paste, hands on math, parallelogram, quadrilateral, rectangle, trapezoid area, visual math Galleries Quadrilaterals Source: Ellsworth D. Foster ed. The American Educator (vol. 1) (Chicago, IL: Ralph Durham Company, 1921)
