40 x 4x – 20
Solve.
Warm up
1.
2y + 28 3y – 14°
2.
42
Questions over HW?Did you have hw?
Congruent triangles have 3 congruent sides and 3 congruent angles.
The parts of congruent triangles that “match” are called corresponding parts.
In a congruence statement
ORDER MATTERS!!!! Everything matches up.
AUG DAY
Corresponding Parts of Congruent Triangles are Congruent
Complete each congruence statement.
If ABC DEF,
then BC ___EF
Complete each congruence statement.
If ABC DEF,
then A ___D
Fill in the blanks
If CAT DOG,
then AC ___OD
Fill in the blanks
BAT MON
T ________ ONM_____ MONM ____
NATBBA
TB
Fill in the blanks
BCA ________ GFE
EGF
CAB
Complete the congruence statement.
_____ JKNMKL
Complete the congruence statement.
_____ CBDABD
There are 5 ways to prove
triangles congruent.
Side-Side-Side (SSS) Congruence Postulate
All Three sides in one triangle are congruent to all
three sides in the other triangle
Side-Angle-Side (SAS) Congruence Postulate
Two sides and the INCLUDED angle
(the angle is in between the 2 marked sides)
Angle-Angle-Side (AAS) Congruence Postulate
Two Angles and One Side that is NOT
included
Angle-Side-Angle (ASA) Congruence Postulate
Two angles and the INCLUDED side
(the side is in between the 2 marked angles)
There is one more way to prove triangles congruent, but
it’s only for RIGHT TRIANGLES…Hypotenuse Leg
}Your Only Ways To Prove
Triangles Are Congruent
NO BAD WORDS
3 markings you can add if they aren’t marked
already
Overlapping sides are congruent in each
triangle by the REFLEXIVE property
Vertical Angles are congruent
Alt Int Angles are congruent
given parallel
lines