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
undefined
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