# AAS Angle, Angle, Side - PowerPoint PPT Presentation

1 / 8

AAS Angle, Angle, Side . Describe how to prove that two triangles are congruent using the AAS postulate. . What Is AAS Postulate .

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

AAS Angle, Angle, Side

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

## AASAngle, Angle, Side

Describe how to prove that two triangles are congruent using the AAS postulate.

### What Is AAS Postulate

• Angle Angle side postulate states that if two angles and its non included side of the triangle is congruent to the corresponding two angles and its non included side of the other triangle, then the two angles are congruent to each other.

EXAMPLE

D

A

B

C

E

F

< A is congruent to <D, <B is congruent to <E, and DE is congruent to AC

Therefore by the AASpostulate, triangle ABC and triangle DEFare congruent

### Angle Angle Side Congruence

H

L

J

Given: <L = <I, <K = <H, L J= GI

Prove: triangle LJK = IGH

G

I

K

STATEMENTS

REASONS

<L = <I, <K = <H 1. given

LJ = GI 2. given

<J = <G 3. Third < theorem

LJK = IGH 4. AAS

### Using AAS to prove Congruent Triangles

• Example 1

Given: AB II DE, BC = CD

Prove: triangle ABC = DEC

A

Statements

Reasons

D

B

C

AB II DE 1. given

BC = CD 2. given

<B = <D 3. Alt. Int. Angle

<A = <E 4. Alt. Int. Angle

ABC = DEC 5. AAS

E

Given: C is the midpoint of AE, AB ll DE

Prove: ABC = DEC

A

D

• Example 2

C

B

E

Statement

Reasons

1. C is the midpoint of AE 1. given

2. AC = CE 2. def. of midpoint

3. AB ll DE 3. given

4. <A = <E 4. Alt. Int. Angle

5. <B = <D 5. Alt. Int. Angle

6. ABC = DEC 6. AAS

• Example 3

A

E

F

C

D

G

Given: CD = EF, <A = <G

Prove: triangle ACD = GFE

Reasons

Statements

CD= EF 1. given

<A = <G 2. given

<C and <F right angle 3. given

<C = <F 4. right angle theorem

ACD = GFE 5. AAS