1
2
3
4
5
100
Area of a Circle
If the radius of a circle is r units, then the area of the circle is πr2 square units.
100
Complementary angles
Complementary angles have measures that add up to 90 degrees.
100
Deposit
When you put money into an account, it is called a deposit.
100
Median
The median is one way to measure the center of a data set. It is the middle number when the data set is listed in order.
100
negative number
A negative number is a number that is less than zero. On a horizontal number line, negative numbers are usually shown to the left of 0.
200
Circumference
The circumference of a circle is the distance around the circle. If you imagine the circle as a piece of string, it is the length of the string. If the circle has radius r then the circumference is 2πr
200
diameter
A diameter is a line segment that goes from one edge of a circle to the other and passes through the center. A diameter can go in any direction. Every diameter of the circle is the same length. We also use the word diameter to mean the length of this segment.
200
Mean
Average
200
For the data set 7, 9, 12, 13, 14, the median is
12
200
origin
The origin is the point (0,0)(0,0) in the coordinate plane. This is where the horizontal axis and the vertical axis cross.
300
Pi number approximations
Some approximations for ππ are 22/7, 3.14, and 3.14159.
300
Probability
The probability of an event is a number that tells how likely it is to happen. A probability of 1 means the event will always happen. A probability of 0 means the event will never happen.
300
For example, for the data set 7, 9, 12, 13, 14, the mean is .....
11.
300
the distance of a number from zero, always positive
absolute value
300
radius
A radius is a line segment that goes from the center to the edge of a circle. A radius can go in any direction. Every radius of the circle is the same length. We also use the word radius to mean the length of this segment.
400
Rational Number
A rational number is a fraction or the opposite of a fraction. For example, 8 and -8 are rational numbers because they can be written as 8/1 and -8/1 Also, 0.75 and -0.75 are rational numbers because they can be written as 75/100 and -75/100
400
Reciprocal
Dividing 1 by a number gives the reciprocal of that number. For example, the reciprocal of 12 is 1/12
400
Mode
Most common number in a set
400
the probability of selecting a moon block at random from this bag is
4/5
400
right angle
A right angle is half of a straight angle. It measures 90 degrees.
500
straight angle
A straight angle is an angle that forms a straight line. It measures 180 degrees.
500
Supplementary angles
have measures that add up to 180 degrees.
500
TRUE OR FALSE: For example, a 15∘ angle and a 165∘ angle are supplementary.
TRUE
500
withdrawal
When you take money out of an account, it is called a withdrawal.
500
For example, a person withdrew $25 from their bank account. Before the withdrawal, they had $350. After the withdrawal, they had......
$325, because 350−25=325350−25=325.