1. Mrs. Spanier Pre-Algebra
Congruent Triangles
Mrs. Spanier
Pre-Algebra

2. Arcs show congruent angles
Special Notations
Arcs show congruent angles
Hash marks show congruent sides

3. Discuss with a neighbor…
What do you look for to know whether triangles are congruent?

4. Are the triangles congruent?
Yes,
∆PQR  ∆STV by Side-Angle-Side (SAS).
PQ = ST = 4
Q = T = 100°
RQ = VT = 5

5. Are the triangles congruent?
NQ = PQ
NY = PY
YQ = YQ
Yes,
∆QYN ∆QYP by Side-Side-Side. (SSS)

6. Are the triangles congruent?
A = D = 90°
PD = PA = 5
BPA = CPD
Yes, ∆BAP  ∆CDP by Angle-Side-Angle. (ASA)

7. The End