top of page
Base Angles
See It in Action
Two examples of the idea done right—and one common look-alike that is not right.
EXAMPLE
EXAMPLE
NON-EXAMPLE
Definition
The base angles of a triangle are the two angles that are adjacent to the base. In an isosceles triangle, the base angles are congruent.
Key points:
The base can be any side of the triangle, but in an isosceles triangle, the base is usually the non-congruent side.
The base angles are the two angles that touch (are adjacent to) the base.
In an isosceles triangle, the base angles are always congruent.
bottom of page