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Congruent Triangles ProofPractice Quiz The quiz below will test your knowledge of all the postulates and theorems that can prove two triangles are congruent.
Theorems and Postulates for proving triangles congruent Hypotenuse Leg Theorem | Side Side Side | Side Angle Side | Angle Side Angle | Angle Angle Side |isosceles triangle proofs|CPCTC | indirect proof| quiz on all theorems/postulates | Images Free Math Printable Worksheets:  Worksheets & Activities on Triangle Proofs
Which postulate/ theoream that proves congruent tiranlges could be used to prove that
 BAC  DEC?
You could use Angle Angle Side because  ACB and DCE are vertical angles.
The trick, of course, is that you cannot use SSA since SSA(Side Side Angle) is not a valid theorem that proves congruent tirangles
Which postulate/ theoream that proves congruent tiranlges could be used to prove that
ABC FED? (Use both the stated given as well as the markings on the picture of the triangles)
The two triangles are congruent by SAS, the side angle side postulate. You'd need to use the addition property of equality to get one pair of the sides.
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