Area of Triangle Small 320×277 Medium 640×554 Large 1024×887 Download Tiff Original 2400×2079 | (215.8 KB) Description "The triangle ABC is divided into 2 right triangles I and II. ABC is seen to be equal to 1/2 of the rectangle ABNO." -Foster, 1921 Keywords equal triangles, half base times height, rectangle, right triangles, triangle area Galleries Miscellaneous Triangles Source: Ellsworth D. Foster ed. The American Educator (vol. 1) (Chicago, IL: Ralph Durham Company, 1921)
