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- Vocabulary: Ratios, Proportions and Similarity

Harry R.

ratio

A comparison of two quantities. (it is a fraction).

equivalent ratios

Ratios that represent the same point on the number line.

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rate

A comparison of two quantities with different units

unit rate

A rate that has a denominator of one.

Constant of Proportionality

The constant value of the ratio of two proportional quantities x and y; usually written

y = kx, where k is the factor of proportionality.

Reduction

The lengths in the scale drawing are smaller than those in the actual object or picture.

Scale Drawing

A two-dimensional drawing of an object that is proportional to the object.

Enlargemant

The lengths in the scale drawing are larger than those in the actual object or picture. (Also called a Magnification.)

One-to-one correspondence

Each point in one figure corresponds to one and only one point in the second figure.

Scale Factor

The ratio of the measure of any side of a scale drawing to it's corresponding measure on the original drawing or object.

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