Exterior And Interior Angles Of A Triangle Small 320×240 Medium 640×481 Large 1024×769 Download Tiff Original 2400×1803 | (249.4 KB) Description An illustration showing a triangle with interior angles A, B, C, and exterior angles D, and A' + B'. Keywords angle, exterior angles, Geometric, geometry, interior angles, triangle, triangles Galleries Miscellaneous Triangles Source: Albert A. Hopkins Scientific America: Handy Book Of Facts And Formulas (New York: Munn & Co., Inc., 1918) 39
