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how do you know when it's cpctc?
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Katie201

by Katie201 at January 10, 2010

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that it's side-angle-side angle-side-angle and when you proved that both triangles were congruent with each other. try to make little notes on the triangles and it will make it easier to see whether the triangles are cpctc
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Glee Glee January 10, 2010

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You know when to use CPCTC by the "prove" or "show".  If the question asks you to prove that two sides or two angles in different triangle are congruent, use CPCTC.  Be careful of more complicated proofs where you need to show two sides or angles are congruent and then make the "prove" or "show" statement (like proving the isosceles triangle conjecture); you will need CPCTC for this as well.
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Brian001 Brian001 January 10, 2010

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CPCTC only holds true once the two triangles are proved to be congruent.
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MathiusTheGreat MathiusTheGreat February 09, 2011

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