1. 4.3 Prove Triangles Congruent October 12, 2011
Bellwork
HW pg. 236 #5­19 odd, 24, 26 1

2. 4.3 Prove Triangles Congruent October 12, 2011
4.3 Prove Triangles Congruent by SSS
Ways to determine if triangles are congruent . . . .
***Remember that the ≅ pieces of the ∆ have to match up!!!!
1. Side­Side­Side (SSS)
*3 pairs of ≅, corresponding sides
If the 3 sides of one ∆ are ≅ to the 3 sides of another ∆, then the ∆’s are ≅ .
B E
A C F
D
M
HW pg. 236 #5­19 odd, 24, 26 2

3. 4.3 Prove Triangles Congruent October 12, 2011
HW pg. 236 #5­19 odd, 24, 26 3

4. 4.3 Prove Triangles Congruent October 12, 2011
Angle­Angle­Angle (AAA)
*3 pairs of ≅, corresponding angles
*** This scenario only proves that 2 triangles are similar.
*** No triangle congruency can be determined.
HW pg. 236 #5­19 odd, 24, 26 4

5. 4.3 Prove Triangles Congruent October 12, 2011
HW pg. 236 #5­19 odd, 24, 26 5

6. 4.3 Prove Triangles Congruent October 12, 2011
HW pg 236
# 5­19 odd,
24, 26
HW pg. 236 #5­19 odd, 24, 26 6