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# February 10, 2014 - PowerPoint PPT Presentation

February 10, 2014. D. E. Aim: Let’s do CPCTC. Find out what it means to me. Given: Rectangle CDEF Prove: Triangle CDF is congruent to Triangle EFD. F. C. Recap: Proofs. Make statements that are supported by valid reasons

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## PowerPoint Slideshow about ' February 10, 2014' - ganesa

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Presentation Transcript

### February 10, 2014

D

E

Aim: Let’s do CPCTC. Find out what it means to me.

Given: Rectangle CDEF

Prove: Triangle CDF is congruent to Triangle EFD

F

C

• Make statements that are supported by valid reasons

• Statements should start off coming from what was given (break it down, why did they give me that specific information) and then by viewing the diagram

• Do not assume anything about a picture

• What are some things that if we see, we know has to be referring to a midpoint?

• What are some things that if we see on the diagram (using no information other than what we see), we know we can make a new congruency statement?

• What are some things parallel lines can give us?

• What can perpendicular lines give us?

• What things, by definition, are perpendicular?

Given: AB = CD

AC is the perpendicular bisector of BD

A

B

Prove: Triangle ABE = Triangle CDE

E

D

C

• Looking back at our last diagram, having already shown the two triangles are congruent, what do we think we can say about the remaining parts of those triangles?

• Remember: CPCTC relies on the CT. We cannot use it until we show the triangles are congruent!

B

Given: CA bisects angle DAB

/ BCA = / DCA

A

C

D

### February 11, 2014

D

E

Aim: Proof Review / Special Cases and Regents Questions

Given: Rectangle CDEF

CA = BE

Prove: Triangle EAD is congruent to Triangle CBF

A

B

F

C

E

Given: Rectangle CDEF

CA = BE

Prove: Triangle EAD is congruent to Triangle CBF

A

B

F

C

From June 2012:

• You may work alone or in groups on the homeworkOR

• You may discuss last night’s homework with each other / with me

TONIGHT’S HW:

Packet section 4-6 (all)