Math unit 4 vocabulary

Question 1

Dilation

Answer 1

Scale factor k>0 and center (0,0) maps (x,y) to (kx, ky)

Question 2

Isometry

Answer 2

A transformation that preserves length, angle measure, and area.

Question 3

Rigid transformation

Answer 3

Another name for isometry.

Question 4

Acute triangle

Answer 4

Three acute angles

Question 5

Equiangular triangle

Answer 5

Three congruent acute angles

Question 6

Right triangle

Answer 6

One right angle

Question 7

Obtuse triangle

Answer 7

One obtuse angle

Question 8

Equilateral triangle

Answer 8

Three congruent sides

Question 9

Isosceles triangle

Answer 9

At least two congruent sides

Question 10

Scalene triangle

Answer 10

No congruent sides

Question 11

Auxiliary line

Answer 11

A line that is added to a figure to aid in a proof.

Question 12

Interior

Answer 12

The set of all points inside the figure.

Question 13

Exterior

Answer 13

The set of all points outside the figure.

Question 14

Interior angle

Answer 14

Formed by two sides of a triangle.

Question 15

Exterior angle

Answer 15

Formed by one side of a triangle and the extension of an adjacent side.

Question 16

Remote interior angle

Answer 16

An interior angle that is not adjacent to the exterior angle.

Question 17

Corresponding angles and corresponding sides

Answer 17

In the same position in polygons with an equal number of side.

Question 18

Congruent polygons

Answer 18

Two polygons if and only if their corresponding angles and sides are congruent.

Question 19

Triangle rigidity

Answer 19

Gives you a shortcut for proving two triangles are congruent.

Question 20

Included angle

Answer 20

An angle formed by two adjacent sides of polygon.

Question 21

Included side

Answer 21

The common side of two consecutive angles in a polygon.

Question 22

CPCTC

Answer 22

An abbreviation for the phrase “Corresponding Parts of Congruent Triangles are Congruent”

Question 23

Coordinate proof

Answer 23

Style of proof that uses coordinate geometry and algebra.

Question 24

Legs (of an isosceles triangle)

Answer 24

The congruent sides.

Question 25

Vertex angle

Answer 25

The angle formed by the legs.

Question 26

Base

Answer 26

The side opposite the vertex angle.

Question 27

Base angles

Answer 27

The two angles that have the base as a side.