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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

Adjacent Angles

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


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


To divide into two equal parts

Concentric Circles

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


Having the same size and shape

Consecutive Angles

Two angles in a polygon with a common side


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


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


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


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


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).


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


intersecting at or forming right angles

Perpendicular Bisector

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


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


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


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°


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.


a line that intersects two or more lines


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)

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