Angles Small 320×148 Medium 640×295 Large 1024×472 Download Tiff Original 2400×1107 | (145.4 KB) Description Four types of angles: right, obtuse, acute, and straight. Keywords acute, angle types, angles, obtuse, right angle, straight angle Galleries Miscellaneous Angles Source: Ellsworth D. Foster ed. The American Educator (vol. 1) (Chicago, IL: Ralph Durham Company, 1921)
