- Isosceles triangles have two congruent sides and two congruent angles.
The two congruent angles are called the base anglesand the unique
angle is called the vertex. The two congruent sides are called the legs
and the unique side is called the base.
● ΔKLO
● KOLO
● ∠LKO ∠KLO
● ΔKLO is isosceles
- Equilateral triangles have three congruent sides and three congruent
angles. The three congruent angles will always each measure 60°. (This
is true because the 180° of the triangles interior angles divided by three
angles equals 60°.)
● ΔABO
● ABBOOA
● ∠ABO ∠BOA ∠OAB
● ΔABO is equilateral
AB
O
60 °^60 °
60 °
K L
O
leg leg
base
(vertex)
501 Geometry Questions
