Wallis, Rolland S. [from old catalog], Iowa state college of agriculture and mechanic arts, Ames. Dept. of engineering extension. [from old catalog] · Ames, Iowa, Engineering extension department, Iowa state college · leaf 62
Equilateral Right Scalene isosceles All sides equal One right angle No two sides equal Two sides equal (a) Triangles … TrapeziumNo two sides parallel TrapezoidParallelograms TrapeziumNo two sides parallel
Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
