AnswersGeometry ACPA 2026Unit Test

Using Triangle Similarity Theorems Answers

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1
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△RST ~ △RYX by the SSS similarity theorem.

Question illustration
A
StartFraction X Y Over T S EndFraction
Option A
B
StartFraction S Y Over R Y EndFraction
Option B
C
StartFraction R X Over X T EndFraction
Option C
D
StartFraction S T Over Y X EndFraction
Option D
2
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In the diagram, .

Question illustration
A
MN and SR
B
MN and QR
C
∠S ≅ ∠N
D
∠S ≅ ∠O
3

Consider the two triangles shown.

Question illustration
A
The given sides and angles cannot be used to show similarity by either the SSS or SAS similarity theorems.
B
The given sides and angles can be used to show similarity by the SSS similarity theorem only.
C
The given sides and angles can be used to show similarity by the SAS similarity theorem only.
D
The given sides and angles can be used to show similarity by both the SSS and SAS similarity theorems.
4

Consider the two triangles.

Question illustration
A
Show that the ratios are equivalent.
Option A
B
Show that the ratios are equivalent.
Option B
C
Show that the ratios are equivalent, and ∠V ≅ ∠Y.
Option C
D
Show that the ratios are equivalent, and ∠U ≅ ∠Z.
Option D
5

Which would prove that ΔABC ~ ΔXYZ? Select two options.

A
StartFraction B A Over Y X = StartFraction B C Over Y Z EndFraction = StartFraction A C Over X Z EndFraction
Option A
B
StartFraction B A Over Y X = StartFraction B C Over Y Z EndFraction , angle C is-congruent-to angle Z
Option B
C
StartFraction A C Over X Z EndFraction = StartFraction B A Over Y X EndFraction , Angle A is-congruent-to Angle X
Option C
D
StartFraction B A Over Y X EndFraction = StartFraction A C Over Y Z EndFraction = StartFraction B C Over X Z EndFraction
Option D
E
StartFraction B C Over X Y EndFraction = StartFraction B A Over Z X EndFraction , Angle C is-congruent-to angle X.
Option E
6

In the diagram, .

Question illustration
A
J measures 60°.
Option A
B
J measures 30°.
Option B
C
I measures 60°.
Option C
D
I measures 30°.
Option D
7

Consider the two triangles.

Question illustration
A
LM is 3 units and XZ is 5 units.
B
LM is 4 units and XZ is 6 units.
C
LM is 5 units and XZ is 3 units.
D
LM is 6 units and XZ is 4 units.
8

2 triangles are shown. The first triangle has side lengths x, x, 50. The second triangle has side lengths 45, 45, 75.

Question illustration
A
1.5
B
20
C
30
D
67.5
9

The ratios of corresponding sides in the two triangles are equal.

Question illustration
A
∠F ≅ ∠J
B
∠I ≅ ∠F
C
∠E ≅ ∠H
D
∠G ≅ ∠I
10

Below are statements that can be used to prove that the triangles are similar. 1. 2. ∠B and ∠Y are right angles.3.?4.?Which two statements are missing in steps 3 and 4?

Question illustration
A
∠X ≅ ∠C△ABC ~ △ZYX by the SAS similarity theorem.
B
∠B ≅ ∠Y△ABC ~ △ZYX by the SAS similarity theorem.
C
= 2△ABC ~ △ZYX by the SSS similarity theorem.
Option C
D
= 2△ABC ~ △ZYX by the SSS similarity theorem.
Option D
11

In the diagram, .

Question illustration
A
MN and SR
B
MN and QR
C
∠S ≅ ∠N
D
∠S ≅ ∠O
12

2 triangles are shown. The first triangle has side lengths x, x, 50. The second triangle has side lengths 45, 45, 75.

Question illustration
A
1.5
B
20
C
30
D
67.5
13

Consider the two triangles.

Question illustration
A
LM is 3 units and XZ is 5 units.
B
LM is 4 units and XZ is 6 units.
C
LM is 5 units and XZ is 3 units.
D
LM is 6 units and XZ is 4 units.
14

Which would prove that ΔABC ~ ΔXYZ? Select two options.

A
StartFraction B A Over Y X = StartFraction B C Over Y Z EndFraction = StartFraction A C Over X Z EndFraction
Option A
B
StartFraction B A Over Y X = StartFraction B C Over Y Z EndFraction , angle C is-congruent-to angle Z
Option B
C
StartFraction A C Over X Z EndFraction = StartFraction B A Over Y X EndFraction , Angle A is-congruent-to Angle X
Option C
D
StartFraction B A Over Y X EndFraction = StartFraction A C Over Y Z EndFraction = StartFraction B C Over X Z EndFraction
Option D
E
StartFraction B C Over X Y EndFraction = StartFraction B A Over Z X EndFraction , Angle C is-congruent-to angle X.
Option E
15

Triangles O N M and S R Q are shown. Angles O N M and S R Q are congruent. The length of side N M is 10 and the length of side S R is 20. The length of side N O is 8 and the length of side Q R is x.

Question illustration
A
16
B
20
C
25
D
50
16

Below are statements that can be used to prove that the triangles are similar. 1. 2. ∠B and ∠Y are right angles.3.?4.?Which two statements are missing in steps 3 and 4?

Question illustration
A
∠X ≅ ∠C△ABC ~ △ZYX by the SAS similarity theorem.
B
∠B ≅ ∠Y△ABC ~ △ZYX by the SAS similarity theorem.
C
= 2△ABC ~ △ZYX by the SSS similarity theorem.
Option C
D
= 2△ABC ~ △ZYX by the SSS similarity theorem.
Option D
17

Consider the two triangles.

Question illustration
A
Show that the ratios are equivalent, and ∠U ≅ ∠X.
Option A
B
Show that the ratios are equivalent, and ∠V ≅ ∠Y.
Option B
C
Show that the ratios are equivalent, and ∠W ≅ ∠X.
Option C
D
Show that the ratios are equivalent, and ∠U ≅ ∠Z.
Option D
18

In the diagram, AB is 6 units, BC is 30 units, and AE is 4 units.

Question illustration
A
16 units
B
20 units
C
24 units
D
28 units
19

2 triangles are shown. The first triangle has side lengths 35, 20, and 20. The second triangle has side lengths x, 44, 44.

Question illustration
A
15.9
B
59
C
77
D
96.8
20

Consider the two triangles shown.

Question illustration
A
The given sides and angles cannot be used to show similarity by either the SSS or SAS similarity theorems.
B
The given sides and angles can be used to show similarity by the SSS similarity theorem only.
C
The given sides and angles can be used to show similarity by the SAS similarity theorem only.
D
The given sides and angles can be used to show similarity by both the SSS and SAS similarity theorems.

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