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WARM-UP:

1.

STATEMENTS REASONS

1. GIVEN

2. 2.

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4-4 Homework: p. 269 [5,6,12-15,24,25]

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STATEMENTS REASONS

A

DC

E

B

C

*HINT* If triangles overlap in the pic, separate them to get a closer look! :-)

1. 1. GIVEN

Both angles sharethe same <C!

2. <C ≅ <C 2. Reflexive Property of Congruence

3. 3. SAA or AAS

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Hint- find the triangles with the given parts to start

A

B

D

CC

B

You can use SSS, SAS, ASA, and SAA/AAS when proving any types of triangles congruent, includingright triangles. However, RIGHT TRIANGLES also have an additional shortcut that is possible!

Notice both triangles have a common leg, side BC. So, BC ≅ BC

Therefore, ΔABC ≅ΔDCB by HL.Then AB ≅ DC by CPCTC.

EX:

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and HL for RIGHT TRIANGLES

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4-5 HW p.279 [6,7,9,10,17,18] and p. 284; 9

CHAPTER 4 TEST on TUESDAY, Nov. 8th!