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GT Geometry Drill 12/6/11

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Which postulate, if any, can be used to prove the triangles congruent?

1.

2.

4.

- STW continue to prove triangle congruent

- Congruent Polygons-Two polygons are congruent if and only if their vertices can be matched up so that corresponding sides and angles are congruent.

Helpful Hint

Two vertices that are the endpoints of a side are called consecutive vertices.

For example, P and Q are consecutive vertices.

To name a polygon, write the vertices in consecutive order. For example, you can name polygon PQRS as QRSP or SRQP, but not as PRQS.

In a congruence statement, the order of the vertices indicates the corresponding parts.

Helpful Hint

When you write a statement such as ABCDEF, you are also stating which parts are congruent.

- Name the congruent triangles
- ∆CAT ∆DOG

G

A

D

O

C

T

DO

OG

DG

D

O

G

CA

AT

CT

C

A

T

- GIVEN: line j | k
- ∆ABC ∆FBE

E

A

j

k

B

C

F

D

C

A

B

Statement

AC AC

< BAC _______

∆ABC ∆CDA

Reason

Given

____________

If_________ ____________

____________

R

S

V

U

T

Statement

Reason

If two angles and a non-included side of one triangle are congruent to two angles and a non-included side of another triangle then the triangles are congruent.