AnswersCR CCSS Math 2 S2 M2960OXTriangle Similarity: AA

Triangle Similarity: AA Answers

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Triangle A B C is reflected and then dilated to form smaller triangle A double-prime B double-prime C double-prime

Question illustration
A
a rotation and a dilation
B
a rotation and a reflection
C
a reflection and a dilation
D
a translation and a dilation
2
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ΔXYZ was reflected over a vertical line, then dilated by a scale factor of , resulting in ΔX'Y'Z'. Which must be true of the two triangles? Select three options.

Question illustration
A
△XYZ ~ △X'Y'Z'
B
XZY ≅ Y'Z'X'
Option B
C
YX ≅ Y'X'
D
XZ = 2X'Z'
E
mYXZ = 2mY'X'Z'
Option E
3

Multiple similarity transformations are performed on a triangle. Which elements must be preserved?

A
orientation
B
side length
C
angle measure
D
overall size
4

Two similar triangles are shown.

Question illustration
A
rotated
B
reflected
C
translated
D
dilated
5

Which diagram can be used to prove △ABC ~ △DEC using similarity transformations?

A
Triangle A B C is rotated about point C and then is dilated to form smaller triangle C E D.
Option A
B
Triangle A B C is reflected across side A C and then is dilated to form smaller triangle C E D.
Option B
C
Triangles A B C and C E D have different angle measures.
Option C
D
Right triangle A B C is shown. Line segment D E is drawn near point C to form triangle D E C.
Option D
6

Question text not available

Question illustration
A
Option
Option A
B
and
Option B
C
and
Option C
D
and
Option D
7

Right triangle ABC is reflected over AC, then dilated by a scale factor of to form triangle DEC. Which statements about the two triangles must be true? Select three options.

Question illustration
A
△ABC ~ △DEC
B
∠B ≅ ∠E
C
3BC = 2EC
D
3DE = 2AB
E
3m∠A = 2m∠D
F
2m∠A = 3m∠D
8

Triangle A E C is shown. Line segment B D is drawn near point C to form triangle B D C.

Question illustration
A
∠BDC and ∠AED are right angles
B
AE ≅ ED
C
△BDC is a right triangle
D
∠DBC ≅ ∠DCB
9

Triangle A B C is reflected across side A C and then is dilated to form smaller triangle D C E. Angles B C A and D C E are right angles.

Question illustration
A
The triangles are not similar because only one pair of corresponding angles is congruent.
B
The triangles are similar because all right triangles can be mapped to each other using a series of transformations.
C
The triangles are not similar because they share a common segment and vertex.
D
The triangles are similar because all pairs of corresponding angles are congruent.
10

Which diagram could be used to prove △ABC ~ △DEC using similarity transformations?

A
Triangle A B C is reflected across side A C and then is dilated to form smaller triangle D C E.
Option A
B
Triangle A B C is reflected, translated to the left, and then is dilated to form triangle D C E.
Option B
C
Triangles A B C and D E C are shown. The angle measures differ between the 2 triangles.
Option C
D
Triangles A B C and D E C are connected at point C. The triangles are shaped differently.
Option D
11

Which composition of transformations will create a pair of similar, not congruent triangles?

A
a rotation, then a reflection
B
a translation, then a rotation
C
a reflection, then a translation
D
a rotation, then a dilation
12

Two similar triangles are shown.

Question illustration
A
rotated
B
reflected
C
translated
D
dilated
13

On a coordinate plane, triangle A B C has points (negative 9, 3), (negative 9, 6), (0, 3) and triangle A double-prime B double-prime C double-prime has points (3, negative 1), (3, negative 2), and (0, negative 1).

Question illustration
A
a reflection over the x-axis, then a dilation by a scale factor of 3
B
a reflection over the x-axis, then a dilation by a scale factor of
Option B
C
a 180° rotation about the origin, then a dilation by a scale factor of 3
D
a 180° rotation about the origin, then a dilation by a scale factor of
Option D
14

Read the proof.Given: AB ∥ DEProve: △ABC ~ △EDC

Question illustration
A
AA similarity theorem
B
ASA similarity theorem
C
AAS similarity theorem
D
SAS similarity theorem
15

The composition is applied to △RST to create the image of △R"S"T", which is not shown.

Question illustration
A
(negative three-halves, nine-halves)
Option A
B
(negative nine-halves, fifteen-halves)
Option B
C
(nine-halves, negative three-halves)
Option C
D
(negative fifteen-halves, 0)
Option D
16

What is true about the image ΔK'L'M'? Select three options.

A
DO, 0.75 (x,y) = (0.75x, 0.75y)
B
LM is parallel to L'M'.
C
KM is shorter than K'M'.
D
The vertices of the image are closer to the origin than those of the pre-image.
E
The distance from M' to the origin is exactly half the distance from M to the origin.
17

On a coordinate plane, 2 polygons are shown. Polygon A B C D has points (negative 3, 3), (5, 3), (5, negative 1), and (1, negative 5). Polygon A prime B prime C prime D prime has points (negative 5, negative 2), (negative 3, negative 2), (negative 3, negative 3), and (negative 4, negative 4).

Question illustration
A
a dilation with a scale factor of and then a rotation
Option A
B
a dilation with a scale factor of and then a translation
Option B
C
a dilation with a scale factor of 4 and then a rotation
D
a dilation with a scale factor of 4 and then a translation
18

Triangle MNP is dilated according to the rule DO,1.5 (x,y)(1.5x, 1.5y) to create the image triangle M'N'P, which is not shown.

Question illustration
A
M'(-6, 9) and N'(4, 9)
B
M'(-6, 9) and N'(3, 9)
C
M'(-2, 3) and N'(7, 9)
D
M'(-2, 3) and N'(1, 3)
19

On a coordinate plane, trapezoids A B D C and M N P Q are shown. The length of A B is 4 units and the length of B D is 2 units. The length of M N is 10 units and the length of N P is 6 units.

Question illustration
A
Yes, because AB and CD are each the lengths MN and QP.
Option A
B
Yes, because sides AB and CD are parallel to sides MN and QP.
C
No, because AB is the length MN but CD is the length QP.
Option C
D
No, because sides AB and CD have different slopes from sides MN and QP.
20

Triangle STV was dilated with the origin as the center of dilation to form S'T'V'.

Question illustration
A
One-third
Option A
B
Two-thirds
Option B
C
Three-halves
Option C
D
Three
Option D

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