http://www.ck12.org Chapter 4. Triangles and Congruence
Congruent Triangles
Recall that two figures are congruent if and only if they have exactly the same size and shape.
Congruent Triangles:Two triangles are congruent if the three corresponding angles and sides are congruent.
4 ABCand 4 DEFare congruent because
AB∼=DE^6 A∼=^6 D
BC∼=EF and^6 B∼=^6 E
AC∼=DF^6 C∼=^6 FWhen referring to corresponding congruent parts of triangles it is calledCorrespondingParts ofCongruentTriangles
areCongruent, orCPCTC.
Example 1:Are the two triangles below congruent?