Dorchester2-01-13-2025-Triangle Congruence with Proofs

Monday, January 13, 2025

Open Ended

Which ONE doesn't belong?

Choose ONE square.

State the letter A, B. C. or D

Then EXPLAIN why it doesn't belong using a complete sentence.

All 3 sides of the triangle are congruent

SSS

2 sides and the included angle of the triangles are congruent

SAS

2 angles and the included side are congruent

ASA

Two sides and a non-included angle do NOT prove congruence​

SSA - NOT CONGRUENT!!

If both triangles are right triangles, you can use HL (hypotenuse-leg) congruence theorem.

​SSA

Quick Check for Understanding!

Open Ended

List the three congruence

statements for the image.

Open Ended

Which postulate (if any) could be

used t show the triangles congruent?

SSS, SAS, ASA

Open Ended

Which postulate (SAS, SSS, ASA, or none) can be used to show that the pair of triangle is congruent?

Draw

Mark the drawing to show the third congruent part.

Open Ended

Which postulate (SAS, SSS, ASA or none) could be used to show the triangles congruent?

​There is a llist of Postulates and Theorems in Schoology. You will need to refer to them to complete your assignment.

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Poll

How confident do you feel about today's lesson?

• I'm good!

• so-so

  kind of got it

• I'm confused!

​Begin assignment in Schoology

TYPE YOUR ANSWERS!

Use words if the symbol is not available
For example: angle YES,
<YES (less than symbol)
BE is parallel to JP
BE || JP (straight line next to ] )
<PUT is congruent to <DOG