Geometry terms

Question 1

Alternate interior angles.

Answer 1

Alternate interior angles lie within a pair of lines and on opposite sides of a transversal.

Question 2

Angle of rotation

Answer 2

The angle of rotation is the number of degrees a figure is rotated

Question 3

Congruent

Answer 3

Two two-dimensional figures are congruent (≅) if the second can be obtained from the first by a sequence of rotations, reflections, and translations

Question 4

Center of rotation

Answer 4

The center of rotation is a fixed point about which a figure is rotated.

Question 5

Corresponding angles

Answer 5

Corresponding angles lie on the same side of a transversal and in corresponding positions.

Question 6

Dilation

Answer 6

A dilation is a transformation that moves each point along the ray through the point, starting from a fixed center, and multiplies distances from the center by a common scale factor. If a vertex of a figure is the center of dilation, then the vertex and its image after the dilation are the same point

Question 7

Enlargement

Answer 7

An enlargement is a dilation with a scale factor greater than 1. After an enlargement, the image is bigger than the original figure.

Question 8

exterior angle of a triangle

Answer 8

An exterior angle of a triangle is an angle formed by a side and an extension of an adjacent side.

Question 9

Image

Answer 9

An image is the result of a transformation of a point, line, or figure

Question 10

Line of reflection

Answer 10

A line of reflection is a line across which a figure is reflected.

Question 11

Reduction

Answer 11

A reduction is a dilation with a scale factor less than 1. After a reduction, the image is smaller than the original figure

Question 12

Reflection

Answer 12

A reflection, or flip, is a transformation that flips a figure across a line of reflection

Question 13

Remote interior angles

Answer 13

Remote interior angles are the two nonadjacent interior angles corresponding to each exterior angle of a triangle

Question 14

Rotation

Answer 14

A rotation is a rigid motion that turns a figure around a fixed point, called the center of rotation.

Question 15

Same-side interior angles

Answer 15

Same-side interior angles are in the interior of two lines on the same side of a transversal

Question 16

Scale factor

Answer 16

The scale factor is the ratio of a length in the image to the corresponding length in the original figure

Question 17

Similar

Answer 17

A two-dimensional figure is similar (∼) to another two-dimensional figure if you can map one figure to the other by a sequence of rotations, reflections, translations, and dilations.

Question 18

Transformation

Answer 18

A transformation is a change in position, shape, or size of a figure. Three types of transformations that change position only are translations, reflections, and rotations

Question 19

Translation

Answer 19

A translation, or slide, is a rigid motion that moves every point of a figure the same distance and in the same direction