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

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

Discuss with a neighbor… What do you look for to know whether triangles are congruent? http://www.math-play.com/Geometry-Math-Games.html http://www.mathsisfun.com/geometry/triangles-congruent.html

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

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

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

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