Acute Triangle Small 247×320 Medium 494×640 Large 790×1024 Download Tiff Original 2400×3109 | (7.1 MB) Description Illustration showing an acute triangle (one that has all three angles that are acute). Keywords acute, angle, angles, geometry, less than 90 degrees, polygon, shape, side, triangle, triangles Galleries Miscellaneous Triangles Source: G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 30
