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19 Cards in this Set
 Front
 Back
angle

Two rays with a common endpoint. The common endpoint is called the vertex of the angle.


line segment: a straight path joining two points, called ENDPOINTS of the line segment.

picture detail: line segment


line: a straight path that extends infinitely in opposite directions.

picture detail:


division

division: Division "undoes" multiplication; 60/12 = 5


addition

Numbers being added are ADDENDS.
The result of addition is called the SUM. Subtraction "undoes" addition. 

diameter: A line segment that passes through the center of a circle or sphere and has endpoints on the circle or sphere; the diameter of a circle is twice its RADIUS.

picture detail: diameter, radius.


angle: right

A right angle has a measure 90 . See picture.


Area: The formula for the area of a rect. is A=l*w where A represents the area, l the length, and w the width.

Area: The formula may also be expressed as A=b*h, where b represents the length of the base and h the height of the rectangle.


angle: acute

An acute angle has a measure greater than 0 and less than 90 . See picture.


product

product: the result of multiplication is called the product.


angle: obtuse

An obtuse angle has a measure greater than 90 and less than 180 . See picture.


multiply: to multiply is to do a multiplication operation.

picture detail: multiplication operation
3 5 = 15 

Angle: straight

A straight angle has measure of 180 . See picture.


Area: the measure of the surface inside a closed boundary. See picture

area model for 3*5=15


Angles: adjacent

Two angles with a common side that do not otherwise overlap. In the diagram, angles 1 and 2 are adjacent angles. So are angles 2, 3 and 4, 4, 1. See picture.


factor

factors: Numbers being multiplied are called factors.


Angles: vertical

angles: vertical
Two intersecting lines from four angles. In the diagram, angles 2 and 4 are vertical angles. They have NO sides in common. Their measures are EQUAL. Angles 1 and 3 are also vertical angles. See picture. 

radius: picture detail

radius: A line segment from the center of a circle or sphere to any point on the circle or sphere; also, the length of such a line segment.


absolute value

The absolute value of a positive number is the number itself. The absolute value of a negative number is the opposite of that number. I.e., 6 is 6.
