proving two triangles are congruent
TRANSCRIPT
1
Learning Target #6 Proving Two Triangles Are
Congruent
2
Methods to Prove 2 Triangles are Congruent:
#1 S #2 AS SS A
#3 A #4 SA AS S
#5 H L
Two methods that do not work:#1
#2
3
#1: SSS (SideSideSide) M
N P
Q
R S
#2: SideAngleSide (SAS)
P
Q
S
X
YW
A
B
C
D
E
F
#3: AngleSideAngle (ASA)
4
#4: AngleAngleSide (AAS)
G
I
H
L
J K
A
CB
D
FE
#5: HypotenuseLeg (HL)
5
Recall previous properties:Reflexive
Transitive
6
Is it possible to prove the triangles are congruent? If so, state the postulate.
a. E
F
G
J
H
b.N
PM
Q
c.U
X
Z
W
1
4
2
3
7
ASSIGNMENTp. 216 #1217p. 223 #813
8
ML
NK
P
Statements Reasons
Given: KM ≅ NPKL ≅ NMLM ≅ MP
Prove: ΔKLM ≅ ΔNMP
*4 steps
9
E
B
A
C
D
1 2
Statements Reasons
Given: BE ≅ CEAE ≅ DE
Prove: ΔABE ≅ ΔDCE
*4 steps
10
A
D
B
E
CGiven: AD || EC, BD ≅ BCProve: ΔABD ≅ ΔEBC
*5 steps
Statements Reasons
11
Statements Reasons7 steps
Given: AB ≅ DC, E is the midpoint of BC and AD
Prove: ΔAEB ≅ ΔDEC
A B
E
DC
*On worksheet
12
*3 ways, 5 steps
Given: FH || LK, GF ≅ GLProve: ΔFGH ≅ ΔLGK
Statements Reasons
L
K
GF
H
13
Given: SV ≅ TV, S ≅ TProve: ΔSVR ≅ ΔTVU
SR
V
U T
Statements Reasons
*4 steps
14
Given: DR AG RA ≅ RG
Prove:ΔDRA ≅ ΔDRG
*6 steps
Statements Reasons1. ______________ 1. ________________2. ______________ 2. ________________3. ______________ 3. 2 lines , form 4 right
angles4. DRA ≅ DRG 4. ________________5. DR ≅ DR 5. ________________6. ______________ 6. ________________
15
Given: E ≅ D, AE ≅ BD, AE || BD
Prove: ΔAEB ≅ ΔBDC
DE
CBA
Statements Reasons
*5 steps
16
Statements Reasons1. 1.2. 2. 3. 3. AIA4. 4. AIA5. BD ≅ BD 5. 6. 6. ASA7. AB ≅ CD 7.
A
B
D
C
Given: AB || CD, BC || DAProve: AB ≅ CD
17
S
M
A
T
R
Given: A is the midpoint of MT A is the midpoint of SR
Prove: MS || TR
Statements Reasons1. 1. 2. 2. 3. MA = TA 3. Def. of Midpoint4. 4. Def. of Congruent Segments5. 5. Def. of Midpoint6. 6. Def. of Congruent Segments7. 7. Vertical angles8. ΔMAS ≅ ΔTAR 8. 9. M ≅ T 9.10. MS || TR 10.
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Statements Reasons1. 1. 2. 2. 3. AC ≅ AC 3.4. 4. ASA5. BC ≅ DC 5. 6. 6. Reflexive7. ΔBCE ≅ ΔDCE 7.
Given: 1 ≅ 2, 3 ≅ 4Prove: ΔBCE ≅ ΔDCE
D
C
B
E A21
43
19
ASSIGNMENTCh. 4 L.T. #6
Practice
20
ASSIGNMENTp. 217 #2024
*For 2324, write 2 column proof, not paragraph
p. 224 #1822