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Unformatted text preview: Equality of Cross Products For any numbers a and c and any nonzero numbers b and d , iff ad = bc . b a = d c Properties of Proportions Properties of Proportions is equivalent to 1. ad = bc 2. 3. 4. a c b d = b d a c = a b c d = a b c d b d + + = Scale Drawing Scale Drawing In a scale drawing , the scale compares each length in the drawing to the actual length. The lengths used in a scale can be in different units. Example: 1 inch = 8 ft. Joke Time Joke Time How do you catch a “unique” rabbit? “Unique” up on him! How do you catch a “tame” rabbit? The “tame” way!...
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This note was uploaded on 12/01/2011 for the course MATH 105 taught by Professor Towns during the Fall '10 term at BYU.
 Fall '10
 Towns
 Geometry, Ratios

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