# Everyday Math Unit 5 Vocabulary (6)

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Math vocabulary for unit 5 of sixth grade Everyday Math. This unit is focused on Geometry: Congruence, Constructions, and Parallel Lines

### Acute Angle

An angle less than 90 degrees but more than 0 degrees

Angles that have a common side and a common vertex (corner point).

### Axis

Either of the two number lines used to form a coordinate grid.

### Bisect

To divide into two equal parts

### Concentric Circles

Circles that lie in the same plane and have the same center

### Congruent

Having the same size and shape

### Consecutive Angles

Two angles in a polygon with a common side

### Coordinate

a pair of numbers used to determine the position of a point on a graph

### Corresponding

Angles or lines of 2 different polygons that are in the same position

### Image

a visual representation (of an object or scene or person or abstraction) produced on a surface

### Inscribed

a circle (on the inside) of a polygon and only touches each side at exactly 1 point

### Isometry Transformation

a transformation or combination of transformations which results in the image being exactly the same shape and size as the pre-image

### Line of Reflection

A line that a figure is flipped across to create a mirror image of the original figure

### Midpoint

a point that divides a segment into two congruent segments

### Obtuse Angle

An angle that measures more than 90 degrees but less than 180 degrees

### Ordered Number Pair

A pair of numbers used to locate a point on a coordinate grid. The fist number corresponds to a position along the horizontal axis (x), and the second number corresponds to a position along the vertical axis (y).

### Origin

the point (0,0) where the x-axis and the y-axis intersect in a coordinate plane

### Parallel Line Segments

Line segements that never intersect (they are always the same distance apart)

### Parallel Lines

lines in the same plane that never intersect

### Perpendicular

intersecting at or forming right angles

### Perpendicular Bisector

A line that is perpendicular to a segment at its midpoint.

### Preimage

the image before the transformation occurs

### Rectangular Coordinate Grid

A device for locating points in a plane using ordered pairs or coordinates

### Reflection (flip)

A transformation that produces the mirror image of a figure.

### Reflex Angle

an angle that is more than 180 degrees but less than 360 degrees

### Right Angle

the 90 degree angle between two perpendicular lines

### Rotation (turn)

A movement of a figure that turns that figure around a fixed point.

### Rough Sketch

Imperfect type of sketch used to plan drawing

### Sector

a plane figure bounded by two radii and the included arc of a circle (this resembles a slice of pizza)

### Skew

two lines that do NOT lie in the same plane, are not parallel, and do not intersect

### Straight Angle

an angle of 180 degrees

### Supplementary Angle

When the sum of the measures of a pair of angles add up to 180°

### Transformation

A function that changes the position or direction of the axes of a coordinate system

### Translation (slide)

A movement of a figure to a new position without turning or flipping it.

### Transversal

a line that intersects two or more lines

### Vertex

The common endpoint of an angle

### Vertical (opposite) Angle

when two lines intersect, the angles that do not share a common side (vertical angles have equal measures)

Example: