The angles opposite those equal sides are also equal because angles opposite equal sides are
also equal.
AB = AC AB ≠ BC
c = b c ≠ a
Your Friend the Triangle
If ever you are stumped by
a geometry problem that
deals with a quadrilateral,
hexagon, or other polygon,
look for the triangles that
you can form by drawing
lines through the figure.
- An equilateral triangle is one in which all three sides are equal in length.
Because the angles opposite equal sides are also equal, all three angles in an equilateral triangle
are equal too. (Their measures are always 60 degrees each.)
Equilateral Triangles
An equilateral triangle
is also isoceles.
