35 terms

# Unmacht Chapter 1

#### Terms in this set (...)

Area
Is the space (or number of squares) inside of the polygon. For example: the length of the rectangle times the width.
Perimeter
Is the measurement around a polygon (or the sum of the outside side lengths).
Triangles
Is a polygon with three sides and three vertices.
Quadrilaterals
Is a four-sided polygon. There are many types of quadrilaterals (i.e. square, the trapezoid, rhombus).
Square
Is a quadrilateral with four equal sides and four right angles.
Rhombus
Any parallelogram with equal sides, including a square.
Rectangle
A plane figure with 2 pairs of opposite, parallel sides and four right angles.
Parallelogram
Is a four sided flat shape where opposite sides are parallel.
Trapezoid
A quadrilateral with only one pair of parallel sides.
Fractions
The division of one number divided by another. Are two numbers that are divided by a line.
Decimals
A number expressed by figures placed to the right of a decimal point.
Percents
Per 100 or out of every 100.
Equivalent fractions
Represent the same value even though they look different.
Multiplicative identity
It is a simple math law that states that multiplying something by 1 leaves it unchanged.
Probability
It is the likelihood of something happening in the future. Could be represented as a fraction, decimal, and a percent. Represented by the numbers 0 to 1 or 0% to 100%.
Theoretical probability
The probability based on mathematics and what we expect to happen, (i.e. 1/2 of the times we flip a coin we should get heads).
Experimental probability
The probability based on what does happen (i.e. In an experiment, it is the ratio of the event occurring to the number of trials / times the activity is performed).
Sample space
Is the set of all the possible outcomes of the event of that experiment.
Compound events
Is one in which there is more than one possible outcome. Determining this probability involves finding the sum of the probabilities of the individual events and, if necessary, removing any overlapping probabilities.
Mean
One way of finding the average of a set of numbers - by adding the numbers together and then dividing by the number of numbers in the set. For example, for the numbers 1, 5, and 6: (1 + 5 + 6) ÷ 3 = 4. This is generally the best measure of central tendency when there are not outliers in the data set.
Outliers
A number in a set of data that is much larger or much smaller than the other numbers in the set.
Proportional Relationship
Two values have this relationship if their graph would be a line that crosses through the origin (0,0).
Median
The middle number of an ordered set of data. If there are two middle numbers, then the average of the two middle numbers is the median. The median is generally more accurate than the mean as a measure of central tendency when there are outliers in the data set.
Repeating Decimal
A decimal that repeats the same sequence of digits forever from some point onward. For example, 4.56073073073... is a decimal for which the three digits 073 continue to repeat forever. Repeating decimals are always the decimal expansions of rational numbers.
Terminating Decimal
Is a decimal that has only a finite number of non-zero digits, such as 4.067
Interval
A set of numbers between two given numbers.
Outcome
Any possible result or actual result of the action considered, such as rolling a 5 on a standard number cube or getting tails when flipping a coin.
Event
A desired (or successful) outcome or group of outcomes from an experiment, such as rolling an even number on a standard number cube.
Identity Property of Multiplication
This property states that multiplying any expression by 1 leaves the expression unchanged. That is, a(1) = a . For example, 437x · 1 = 437x.
Giant One
A fraction that is equal to 1, such as 2/2 or 4/4 or 8/8. Multiplying any fraction by a Giant One will create a new fraction equivalent to the original fraction.
Lowest Common Denominator
The smallest common multiple of the denominators of two or more fractions. For example, the LCD of 1/4 and 5/6 is 12.
Prime number
A positive integer with EXACTLY TWO factors. Examples are the numbers 2, 3, 17, and 31.
Prime factor
A factor that is a prime number.
Scalene Triangle
A triangle with no congruent sides.
Right triangle
A triangle that has one 90 degree angle.
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