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geometry
videotext, unit IV, part C, lesson 1
6
Mathematics
10th Grade
06/17/2011

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Term
similarity
Definition
from the Latin meaning like, this is a relationship between geometric figures which have the same shape, but not necessarily the same size. Informally, in similar polygons, corresponding angles are congruent, and corresponding sides are in proportion.
Term
ratio
Definition
from teh Latin, meaning computation, this is a numerical comparison between two numbers (found by division), generally expressed as a fraction. Specifically, for two numbers, and and b, the ration of a to b, is a/b, with b not equaling zero. Note: another common way to express a ration is by using a colon between the numbers. For example, the ration of x to y can be expressed as x:y.
Must use the same units
Term
extended ration
Definition
a numerical comparison between three or more numbers, generally expressed in the colon format. for example, the comparison between the three numbers t u and v cna be expressed as t:u:v.
Term
Proportion
Definition
from the Latin, meaning for its portion, this is a relation stating that two ratios are equal. for example x/y = a/b is a proportion adn is read, "x is to y as a is to b". As well, this proportion could be expressed using colons as follows x:y= a:b
Term
terms of a proportion
Definition
any of the four individual numbers in a proportion. for example, in teh proportion x:y = A:b, x is the first term adn b is the fourth term (also called fourth proportional. the first and fourth often called extremes and the second and third terms are often called the means
Term
terms of a proportion
Definition
any of the four individual numbers in a proportion. for example, in teh proportion x:y = A:b, x is the first term adn b is the fourth term (also called fourth proportional. the first and fourth often called extremes and the second and third terms are often called the means
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