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Chapter 4- Triangle Congruence
供稿人: Lewis
(原作者: Dilaura)
4.1 
Classify the triangle by its angle measure.
obtuse triangle
 right triangle
equlangular triangle
acute triangle
4.1 
Classify the triangle by its angle measure.
obtuse triangle
 right triangle
equlangular triangle
acute triangle
86o
64o
4.1 
Classify the triangle by its side length.
isosceles triangle
scalene triangle
equilateral triangle
right triangle
4.1 
Classify the triangle by its side length.
equilateral triangle
 right triangle
scalene triangle
isosceles triangle
Find the 
measure of ∡A
4.2
m∡A = 
B
o
25o
C
127o
x
A
4.1
Find the 
measure of ∡A
m∡A = 
B
25o
o
x
A
C
4.1
Find the 
measure of ∡A
m∡A = 
A
o
x
51o
B
C
4.4
Tell if and why the triangles are congruent.
Not congruent, not enough info
∡A ≅ ∡C, Triangles are ≅ by SAS Postulate.
BD ≅ BD, Triangles are ≅, by SSS Postulate.
Triangles are ≅ by the ASA Postulate 
A
B
D
C
4.4
Tell if and why the triangles are congruent.
Not congruent, not enough info
AB ≅ AC, Triangles are ≅ by SSS Postulate
BD ≅ BD, Triangles are ≅, by SAS Postulate
Triangles are ≅ by the SSA Postulate 
A
B
D
C
4.4
Tell what value x must be in order for the
two triangles to be congruent by SSS ∆≅ Thm.
6x - 4
B
x = 
A
C
4x + 7
D
4.4
Tell if and how the two triangles are congruent.
C
A
Not congruent, not enough info
AC ≅ED, Triangles are ≅ by SSS Postulate
 ∡ABC ≅EBD, Triangles are ≅ by SAS Postulate
B
D
E
4.5
Identify the postulate or theorem that 
proves the two triangles are congruent.
A
not congruent, not enough info
Triangles ≅ by AAA Postulate.
Triangle ≅ by ASA Postulate
Triangle ≅ by AAS Postulate
B
E
D
C
Tell if (and why) the highlighted statement is true.

Triangles ≅ by SSS, True by CPCTC
Triangles ≅ by SSS, False ∡'s not congruent
Triangles ≅ by SAS ,True by CPCTC
Triangles are not ≅, False ∡'s not congruent
∡A ≅ ∡B
A
C
B
D
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