
The magnitude of a number, irrespective of its sign. Written as a number inside vertical lines: [3] =3 and [3]=3.
absolute value

An angle measuring less than 90°. A triangle with three of these is called a ______ triangle.
acute angle

Two line segments coming together at a point called the vertex.
angle

A measure, in square units, of the size of a region in a plane. Finding the _____ of a figure usually involves multiplying two dimensions, such as length and width or base and height. The _____ of a circle is found by multiplying pi by the square of the radius.
area

An integer that has more factors than one and itself; i.e., a nonprime integer greater than 1. The first ten are 4,6,8,9,10,12,14,15,16,18.
composite

Two angles whose measures add up to 90 degrees. ex. A 30 degree angle and a 60 degree
complementary angles

A solid generated by rotating a right triangle about one of its legs
cone;also called right circular cone.

A rectangular solid whose faces are all squares.
cube

A line segment formed by the intersection of two faces of a threedimensional shape.
edge

A number to be divided (e.g. in 12/3= 4 it is 12)
dividend

A number that divides into another number
divisor

An oval shape, literally a set of points in a plane for which the sum of the distances from two points (called foci) is constant
ellipse

A triangle with three equal sides and three equal angles of 60 degrees.
equilateral triangle

a polygon formed by edges of a solid
face

A positive integer that divides into n with no remainder
factor (of n) ( eg. factors of 18 is 1,2,3,6,9,18)

The side of a right triangle opposite the right angle. Also the longest side.
hypotenuse

A number that cannot be represented on the number line because it contains a factor of i
imaginary number

Any of the natural numbers (also known as "whole numbers"), the negatives of these numbers, or zero.
integer

A triangle with two sides of equal length
isosceles triangle

The two sides of a right triangle that are not the hypotenuse (i.e. are not opposite the right angle)
legs

A number that n will divide into with no remainder. Some of the multiples of 18 are 0,18,36, 54,72, and 90.
multiple (of n)

