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19 Cards in this Set

  • Front
  • Back
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 "undoes" multiplication; 60/12 = 5
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: 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.
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.