AnswersGeometrySimilarity Transformations

Similarity Transformations — Test Answers

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1
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Is rectangle EFGH the result of a dilation of rectangle ABCD with a center of dilation at the origin? Why or why not?

A
Yes, because both figures are rectangles and all rectangles are similar.
B
Yes, because corresponding sides are parallel and have lengths in the ratio 4 thirds .
C
No, because the center of dilation is not at open paren 0 comma 0 close paren .
D
No, because corresponding sides have different slopes.
2
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What is the length of line segment SR ?

A
9 units
B
18 units
C
12 units
D
15 units
3

What is the perimeter of triangle WXY ?

A
12 point 2 2 cm
B
11 point 5 7 cm
C
14 point 5 0 cm
D
12 point 4 6 cm
4

Which statements can be concluded from the diagram and used to prove that the triangles are similar by the SAS similarity theorem?

A
the fraction with numerator cap r cap s and denominator cap v cap u is equal to the fraction with numerator cap s cap t and denominator cap u cap t is equal to the fraction with numerator cap r cap t and denominator cap v cap t
B
the fraction with numerator cap r cap s and denominator cap v cap u is equal to the fraction with numerator cap t cap u and denominator cap t cap s and angle cap s is congruent to angle cap u
C
the fraction with numerator cap r cap s and denominator cap v cap u is equal to the fraction with numerator cap s cap t and denominator cap u cap t and angle cap s is congruent to angle cap u
D
the fraction with numerator cap r cap s and denominator cap v cap u is equal to the fraction with numerator cap t cap u and denominator cap t cap s is equal to the fraction with numerator cap r cap t and denominator cap v cap t
5

On a number line, the directed line segment from Q to S has endpoints Q at −14 and S at 2. Point R partitions the directed line segment from Q to S in a 3:5 ratio. Which expression correctly uses the formula open paren the fraction with numerator m and denominator m plus n close paren times open paren x sub 2 minus x sub 1 close paren plus x sub 1 to find the location of point cap r ?

A
open paren the fraction with numerator 3 and denominator 3 plus 5 close paren times open paren 2 minus 14 close paren plus 14
B
open paren the fraction with numerator 3 and denominator 3 plus 5 close paren times open paren 2 minus negative 14 close paren plus negative 14
C
open paren the fraction with numerator 3 and denominator 3 plus 5 close paren times open paren negative 14 minus 2 close paren minus 2
D
open paren the fraction with numerator 3 and denominator 3 plus 5 close paren times open paren negative 14 minus 2 close paren plus 2
6

Is triangle cap A prime cap b prime cap c prime a dilation of triangle ABC ? Explain.

A
No, it is not a dilation because the points of the image are not moved away from the center of dilation proportionally.
B
Yes, it is an enlargement with a scale factor of 3 .
C
Yes, it is an enlargement with a scale factor of 8 thirds .
D
No, it is not a dilation because the sides of the image are proportionally reduced from the pre-image.
11

Why is the information in the diagram enough to determine that triangle LMN approximates triangle PON using a rotation about point cap n and a dilation?

A
because one pair of congruent corresponding angles is sufficient to determine similar triangles
B
because both triangles appear to be equilateral
C
because angle MNL and angle ONP are congruent angles
D
because both triangles appear to be isosceles, angle MNL is congruent to angle ONP , and angle NOP is congruent to angle OPN
12

To prove that triangle cap d cap f cap e approximates triangle cap g cap f cap h by the SAS similarity theorem, it can be stated that the fraction with numerator cap d cap f and denominator cap g cap f is equal to the fraction with numerator cap e cap f and denominator cap h cap f and

A
angle cap d cap f cap e is congruent to angle cap g cap f cap h .
B
angle cap d cap f cap e is 4 times greater than angle cap g cap f cap h .
C
angle cap f cap h cap g is congruent to angle cap e cap f cap d .
D
angle cap f cap h cap g is 1 fourth the measure of angle cap f cap e cap d .
13

Which transformations could have occurred to map triangle ABC to triangle cap A double prime cap b double prime cap c double prime ?

A
a reflection and a dilation
B
a rotation and a reflection
C
a dilation and a rotation
D
a translation and a dilation
15

What is the value of x ?

A
12 units
B
20 units
C
15 units
D
25 units
16

To prove that the triangles are similar by the SAS similarity theorem, it needs to be shown that

A
the fraction with numerator cap A cap c and denominator cap g cap i is equal to the fraction with numerator cap b cap c and denominator cap h cap i .
B
the fraction with numerator cap A cap c and denominator cap g cap i is equal to the fraction with numerator cap h cap i and denominator cap b cap c .
C
angle cap c is congruent to angle cap c .
D
angle cap c is congruent to angle cap g .
18

What are the coordinates of vertex cap j of the pre-image?

A
open paren 0 comma negative 1 close paren
B
open paren 0 comma 0 close paren
C
open paren 0 comma 4 close paren
D
open paren 0 comma negative 4 close paren

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