Marks' first lessons in geometry / In two parts. Objectively presented, and designed for the use of primary classes in grammar schools, academies, etc.

by Bernhard Marks

Name one that is equilateral.

In any equilateral triangle the three angles are equal to each other.

On account of its equal angles, it is also called an equiangular triangle.

What is Fig. 8 called on account of its three equal sides? On account of its three equal angles?

Every equilateral triangle is also equiangular.

Every equiangular triangle is also equilateral.

Name a triangle that has no two sides equal to each other.

It is called a scalene triangle.

What kind of a triangle is Fig. 5 on account of its right angle?

What kind on account of its three unequal sides?