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Congruent Triangles
The student is able to (I can):
• Identify and prove congruent triangles given
— Three pairs of congruent sides (Side-Side-Side)
— Two pairs of congruent sides and a pair of congruent— Two pairs of congruent sides and a pair of congruent
included angles (Side-Angle-Side)
— A Hypotenuse and a Leg of a right triangle
SSS – Side-Side-Side
If three sides of one triangle are congruent
to three sides of another triangle, then the
triangles are congruent.
I C P6
T N U
4
6
7 4 7
ΔTIN ≅ ΔCUP
Example Given: , D is the midpoint of
Prove: ΔFRD ≅ ΔERD
F
R
ED
FR ER≅ FE
StatementsStatementsStatementsStatements ReasonsReasonsReasonsReasonsStatementsStatementsStatementsStatements ReasonsReasonsReasonsReasons
1. 1. Given
2. D is midpt of 2. Given
3. 3. Def. of midpoint
4. 4. Refl. prop. ≅
5. ΔFRD ≅ ΔERD 5. SSS
FR ER≅
FE
FD ED≅
RD RD≅
SAS – Side-Angle-Side
If two sides and the included angle of one
triangle are congruent to two sides and the
included angle of another triangle, then the
triangles are congruent.
H U
L
S
T
A
ΔLHS ≅ ΔUTA
Example Given: , A is the midpoint of
Prove: ΔFAR ≅ ΔEAM F
R
A
M
E
FA EA≅ RM
E
StatementsStatementsStatementsStatements ReasonsReasonsReasonsReasons
1. 1. Given
2. ∠FAR ≅ ∠EAM 2. Vertical ∠s
3. A is midpt of 3. Given
4. 4. Def. of midpoint
5. ΔFAR ≅ ΔEAM 5. SAS
FA EA≅
RM
RA MA≅
HL – hypotenuse-leg
If the hypotenuse and leg of one right
triangle are congruent to the hypotenuse
and leg of another right triangle, then the
two triangles are congruent.
J
E
M
O
E
AC
∆JOE ≅ ∆MAC

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2.7.2 SSS, SAS, and HL

  • 1. Congruent Triangles The student is able to (I can): • Identify and prove congruent triangles given — Three pairs of congruent sides (Side-Side-Side) — Two pairs of congruent sides and a pair of congruent— Two pairs of congruent sides and a pair of congruent included angles (Side-Angle-Side) — A Hypotenuse and a Leg of a right triangle
  • 2. SSS – Side-Side-Side If three sides of one triangle are congruent to three sides of another triangle, then the triangles are congruent. I C P6 T N U 4 6 7 4 7 ΔTIN ≅ ΔCUP
  • 3. Example Given: , D is the midpoint of Prove: ΔFRD ≅ ΔERD F R ED FR ER≅ FE StatementsStatementsStatementsStatements ReasonsReasonsReasonsReasonsStatementsStatementsStatementsStatements ReasonsReasonsReasonsReasons 1. 1. Given 2. D is midpt of 2. Given 3. 3. Def. of midpoint 4. 4. Refl. prop. ≅ 5. ΔFRD ≅ ΔERD 5. SSS FR ER≅ FE FD ED≅ RD RD≅
  • 4. SAS – Side-Angle-Side If two sides and the included angle of one triangle are congruent to two sides and the included angle of another triangle, then the triangles are congruent. H U L S T A ΔLHS ≅ ΔUTA
  • 5. Example Given: , A is the midpoint of Prove: ΔFAR ≅ ΔEAM F R A M E FA EA≅ RM E StatementsStatementsStatementsStatements ReasonsReasonsReasonsReasons 1. 1. Given 2. ∠FAR ≅ ∠EAM 2. Vertical ∠s 3. A is midpt of 3. Given 4. 4. Def. of midpoint 5. ΔFAR ≅ ΔEAM 5. SAS FA EA≅ RM RA MA≅
  • 6. HL – hypotenuse-leg If the hypotenuse and leg of one right triangle are congruent to the hypotenuse and leg of another right triangle, then the two triangles are congruent. J E M O E AC ∆JOE ≅ ∆MAC