1. 5.4 Equilateral and Isosceles Triangles

2. What We Will Learn Base Angles Thm
Using Isosceles and Equilateral triangles

3. Needed Vocab Legs of isosceles triangle: the two congruent sides
Vertex angle: angle formed by the legs
Base: third side of isosceles triangle
Base angles: two other angles formed by the base and the legs

4. Ex. 1 Naming Parts
Fill in the blanks
1. G and K
2. KH and KJ

5. Ex. 2/3 Finding Angle Measures
Find x and y
Finding y:
y = 4
Sides opposite congruent angles are congruent
Finding x:
NL = 4
NL = LM
4 = x + 1
−1 −1
3 = x

6. Your Practice
Find x and y
x = 60
y = 60