ALEKS Set 1

straight angle

180 degrees

set

a collection of objects or numbers that is often shown using braces

grid

a network of horizontal and vertical lines that provide coordinates for locating points on an image

Line

a straight 1 dimensional figure that goes to infinity

degree

a unit of angle measure

acute angle

an angle that measures less than 90 degrees

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dividing by 0

decreasing

going down

increasing

going up

Rotation

moving around a central point or axis

dividend

the number that is being divided

congruent

Having the same size and shape

right angle

90 degree angle

angle

A figure formed by two rays with a common endpoint

protractor

A tool used to measure angles

Reflection

A transformation that "flips" a figure over a mirror or reflection line.

obtuse angle

An angle between 90 and 180 degrees

perpendicular lines

Lines that intersect to form right angles

translation

Sliding all the points of a shape according to given directions (up/down, right / left)

perimeter

The distance around a figure

divisor

The number by which another number is divided.

measure

To determine the size, amount, or degree of an object by comparison with a standard unit.

Union

join two sets together

parallel lines

lines in the same plane that do not intersect

difference

subtraction

intersection

the set of points the figures have in common