Download Polygon Monsters

5.1 Isosceles & Equilateral
Triangles
Isosceles Triangles Facts:
1.) The base angles of an
isosceles triangle are congruent.
2.) The line of symmetry for an
isosceles triangle bisects the
vertex angle and is the
perpendicular bisector of the
base.
3.) If two angles of a triangle are
congruent, then the sides
opposite those angles are
congruent.
Equilateral Triangle Facts:
1.) An equilateral triangle is also
equiangular.
2.) Each of the three lines of
symmetry for an equilateral
triangle bisects an angle of the
triangle and is the perpendicular
bisector of the side opposite that
angle.