Isosceles, Equilateral and Right Triangles, using congruency properties.

1. Section 4.6

2.  Base Angles Theorem:
◦ If two sides of a triangle are congruent, then their
opposite angles are also congruent.
 Converse of the Base Angles Theorem:
◦ If two angles of a triangle are congruent, then
their opposite sides are also congruent

3.  Equilateral triangles are also
equiangular
 Equiangular triangles are also
equilateral

4.  If the hypotenuse and one leg of a
right triangle are congruent to those
of another right triangle, then the two
triangles are congruent

5. • Find x
81
9x + 18

6. A C
x
82°
y
x
D
B
Are AB and CD parallel?