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# Triangle Congruence

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Author: Jonathan Heeren
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9.3.3.6 Know and apply properties of congruent and similar figures to solve problems and logically justify results.

a) I can recognize congruent figures and justify

congruency of two triangles.

b) I can recognize similar figures.

c) I can calculate lengths in similar figures using

proportional reasoning including real-world

applications.

d) I can logically justify the similarity of two triangles.

(more)

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Tutorial

## 5 ways to prove triangles are congruent

Please copy down these 5 ways to prove triangles congruent into your notes.

## SSS, SAS, ASA, AAS theorems

This video shows how to prove 2 triangles are congruent using Side-Side-Side, Side-Angle-Side, Angle-Side-Angle, Angle-Angle-Side

## Hypotenuse Leg theorem

This short video explains the only time that Side-Side-Angle theorem works (in a right triangle).

## Proof Example

This is an example of a proof showing that 2 triangles are congruent.

## Examples of Proofs

Here is another example of what a proof looks like

## Geometry Proof Packet

This is page 2-3 of your proof packet that you received in class today. It is some examples to help you get started.

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## Triangle Congruence WS

Recognizing congruent triangles and why

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## Proofs of Congruent triangles

This is practice proving from start to finish

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