4.4 & 4.5 notes
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Transcript of 4.4 & 4.5 notes
4.4 & 4.5 Triangle Congruence Theorems
HW pg. 243 #321 multiples of 3, 25, 26, 34, pg. 252 #318 multiples of 3, 31 & 33 1
October 17, 2013
Bellwork
4.4 & 4.5 Triangle Congruence Theorems
HW pg. 243 #321 multiples of 3, 25, 26, 34, pg. 252 #318 multiples of 3, 31 & 33 2
October 17, 2013
4.4 Prove Triangles Congruent by SASPencil Demonstration.
2. SideAngleSide (SAS)*2 sides and the INCLUDED angle
If 2 sides & the included angle of one ∆ are ≅ to the 2 sides and included angle of another ∆, then the ∆’s are ≅ .
WX
Y
M
N
P
4.4 & 4.5 Triangle Congruence Theorems
HW pg. 243 #321 multiples of 3, 25, 26, 34, pg. 252 #318 multiples of 3, 31 & 33 3
October 17, 2013
4.4 & 4.5 Triangle Congruence Theorems
HW pg. 243 #321 multiples of 3, 25, 26, 34, pg. 252 #318 multiples of 3, 31 & 33 4
October 17, 2013
SideSideAngle (SSA)*** No conclusion can be made from SSA
Make triangle
A
CB D
E F
3. HypotenuseLeg ≅ HL* Hypotenuse, leg, right
If the hypotenuse and a leg of a right ∆ are≅ to the hypotenuse and a leg of a 2nd right ∆ , then the 2 ∆s are ≅.
30°
30°
http://www.youtube.com/watch?v=wvYaFaMAwcc&feature=related
4.4 & 4.5 Triangle Congruence Theorems
HW pg. 243 #321 multiples of 3, 25, 26, 34, pg. 252 #318 multiples of 3, 31 & 33 5
October 17, 2013
4.4 & 4.5 Triangle Congruence Theorems
HW pg. 243 #321 multiples of 3, 25, 26, 34, pg. 252 #318 multiples of 3, 31 & 33 6
October 17, 2013
HW pg. 243 #321 mult. of 3,
25, 26, 34
4.4 & 4.5 Triangle Congruence Theorems
HW pg. 243 #321 multiples of 3, 25, 26, 34, pg. 252 #318 multiples of 3, 31 & 33 7
October 17, 2013
4. AngleSideAngle (ASA)*2 angles and the INCLUDED side
If 2 angles & the included side of one ∆ are ≅ to the 2 angles and included side of another ∆, then the ∆’s are ≅ .
5. AngleAngleSide (AAS or SAA)*2 angles and the NON included side
If 2 angles and the nonincluded side of one ∆ are ≅ to the 2 angles and nonincluded side of another ∆,then the ∆’s are ≅ .
A
B
C D
E
F
W X
Y M
NP
4.5 Prove Triangles Congruent by ASA & AAS
4.4 & 4.5 Triangle Congruence Theorems
HW pg. 243 #321 multiples of 3, 25, 26, 34, pg. 252 #318 multiples of 3, 31 & 33 8
October 17, 2013
4.4 & 4.5 Triangle Congruence Theorems
HW pg. 243 #321 multiples of 3, 25, 26, 34, pg. 252 #318 multiples of 3, 31 & 33 9
October 17, 2013
Other Scenarios1. AngleAngleAngle (AAA)
*** This scenario only proves that 2 triangles are similar.*** No triangle congruency can be determined.
2. SideSideAngle (SSA)*** No conclusion can be made from SSA
4.4 & 4.5 Triangle Congruence Theorems
HW pg. 243 #321 multiples of 3, 25, 26, 34, pg. 252 #318 multiples of 3, 31 & 33 10
October 17, 2013
HW pg. 252 #318 mult. of 3, 31 & 32