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Unit 3: Ratios and Proportional Relationships
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Terms in this set (27)
Ratio
A comparison of two quantites by division.
Rate
A ratio that compares two quantities measured in different units.
Unit Rate
A rate in which the second quantity in the comparison is one unit.
Equivalent Ratios
Ratios that name the same comparison.
Proportions
An equation that states that two ratios are equivalent.
Cross Product
The product of numbers on the diagonal when comparing two ratios.
Percent
A ratio comparing a number to 100.
Function
An input-output relationship that has exactly one output for each input.
Input
The value substituted into an expression or function.
Output
The value that results from the substitution of a given input into an expression or function.
Similar Figures
Figures with the same shape but not necessarily the same size are similar.
Corresponding Sides
Matching sides of two or more polygons.
Corresponding Angles
Matching angles of two or more polygons.
Indirect Measurement
The technique of using similar figures and proportions to find a measure.
Scale Model
A proportional model of a three-dimensional object.
Scale Factor
The ratio used to enlarge or reduce similar figures.
Scale
The ratio between two sets of measurements.
Scale Drawing
A drawing that used a scale to make an object smaller than or larger than the real object.
Direct Variation
A linear relationship between two variables that can be written in the form of y=kx.
Constant of Proportionality
Constant value of the ration of proportional quantites x and y.
Percent of Change
The amount, in percent, that a number increases or decreases.
Commission
A fee paid to a person for making a sale.
Commission Rate
The fee paid to a person who makes a sale expressed as a percent of the selling price.
Interest
The amount of money charged for borrowing or using money, or the amount of money earned by saving money.
Simple Interest
A fixed percent of the principal.
Principal
The inital amount of money borrowed or saved.
Rate of Interest
The percent charged or earned on an amount of money.
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