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Geometry > Unit 9 > Flashcards

Unit 9 Flashcards

1
Q

A proportion is an equation that states that two ratios are _____.

A

Equal

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2
Q

Angle of _____ symmetry is the smallest angle through which a preimage can be rotated to coincide with its image.

A

Rotational

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3
Q

A ____ is a repeating pattern that completely covers a plane with no gaps or overlaps.

A

Tessellation

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4
Q

Similar polygons are polygons whose corresponding _____ are congruent and whose corresponding sides are proportional.

A

Angles

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5
Q

A translation is a congruent transformation along a vector such that each segment joining a point and its _____ has the same length as the vector and is parallel to the vector.

A

Image

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6
Q

A _____ reflection is the composition of transformations that results when a translation is followed by a reflection across a line parallel to the translation vector.

A

Glide

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7
Q

The ratio of the length of one side of a polygon with the length of a corresponding side of a similar polygon is called the _____ ratio.

A

Similarity

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8
Q

The first and last terms of a proportion are called the _____.

A

Extremes

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9
Q

A dilation is a noncongruent transformation in which the _____, but not the shape of a geometric figure is changed.

A

Size

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10
Q

_____ of rotational symmetry is the number of times an image can coincide with its preimage as it rotates through 360°.

A

Order

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11
Q

A translation is a congruent transformation along a vector such that each segment joining a _____ and its image has the same length as the vector and is parallel to the vector.

A

Point

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12
Q

A _____ is the ratio of any linear measurement of the image to the corresponding measurement of the preimage in a dilation.

A

Scale factor

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13
Q

A quantity that has both length and direction is called a(n) _____.

A

Vector

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14
Q

A _____ transformation is a noncongruent transformation in which the points on a given line in a geometric figure remain fixed while other points of the figure are shifted parallel to the line by a distance proportional to their perpendicular distance from the line.

A

Shear

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15
Q

A _____ is the composition of transformations that results when a translation is followed by a reflection across a line parallel to the translation vector.

A

Glide Transformation

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16
Q

A _____ is a noncongruent transformation in which the size, but not the shape of a geometric figure is changed.

A

Dilation

17
Q

Angle of rotational symmetry is the smallest angle through which a _____ can be rotated to coincide with its image.

A

Preimage

18
Q

______ of rotational symmetry is the number of times an image can coincide with its preimage as it rotates through 360°.

A

Order

19
Q

If two angles of one triangle are congruent to two angles of another triangle, then the two triangles are similar.

A

AA similarity Postulate

20
Q

If a line divides two sides of a triangle proportionally, then it is parallel to the third side.

A

Converse of the (DELTA) Proportionality Theorem

21
Q

If two sides of one triangle are proportional to two sides of another triangle and their included angles are congruent, then the triangles are similar.

A

SAS Similarity Theorem

22
Q

If the measures of the three sides of one triangle are proportional to the measures of the corresponding three sides of another triangle, then the triangles are similar.

A

SSS Similarity Theorem

23
Q

If three or more parallel lines intersect two transversals, then they divide the transversals proportionally.

A

Corollary 1 of the (DELTA)
Proportionality Theorem

24
Q

A _____ is an equation that states that two ratios are equal.

A

Proportion

25
Q

A polygon is similar to itself.

A

Reflexive

26
Q

The second and third terms in a proportion are called the _____.

A

Means

27
Q

A physical representation of an object to the size of the actual object is called a _____.

A

Scale model

28
Q

In a proportion, the product of the means is equal to the product of the extremes.

A

Means-Extremes

29
Q

A _____ is a relationship between two similar quantities.

A

Ratio

30
Q

The _____ is the ratio of the size of a model of an object to the size of the actual object.

A

Scale ratio

31
Q

The first and last terms in a proportion are called the _____.

A

Extremes

32
Q

____ polygons are polygons whose corresponding angles are congruent and whose corresponding sides are proportional.

A

Similarly

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