4'6 Isosceles Triangles

1
4.6 Isosceles Triangles
2
Thms, Posts, Cors

• Isosc ? Thm 2 sides of ? are congruent iff lts
  opp those sides are congruent

B
A
C
3
Thms, Posts, Cors

• Cor 4.3 ? equilateral iff equiangular ?
• Cor 4.4 each lt of equilateral ? is 60

4
Example
Find x
Find meas of base lts
x
2x-10
5
X
Given ?XKF is equilateral XJ bis
ltX Prove J is midpt of KF
1
2
K
F
J
6

• 4.6 p. 219
• (10-28 even, 36, 40-54 even)