chapter 7 Flashcards

1
Q

Basic def of similar (general object)

A

2 objects are similar if they are the same shape but different sizes

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2
Q

in geo, two polygons are similar if:

A
  1. all of their corresponding angles are congruent
  2. The lengths of their corresponding sides are in proportion
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3
Q

statement of proportionality

A

uses letters ex CW/PI = CO/PZ = DS/ZG = WS/IG

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4
Q

ratios always compare _______ to another ________

A

polygon, polygon

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5
Q

ORDER…

A

MATTERS

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6
Q

similarity statement

A

name the shapes as you would a congruence statement than use the similarity sign

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7
Q

what is the similarity sign

A

~

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8
Q

what is the abbreviation for scale factor

A

S.F

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9
Q

what is a scale factor

A

a ratio of two corresponding sides that both have numbers ex 10/5 or 4/2

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10
Q

when setting up a proportion to find a missing side length, the first ratio is the ______ ________. The other ratio should include the _______ _______ and it’s cooresponding side

A

scale factor, unknown side

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11
Q

when is the only time you use the similarity symbol

A

in the similarity statement

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12
Q

AA~

A

shows 2 pairs of corresponding angles that are congruent

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13
Q

SAS~

A

shows 2 pairs of coorespoding sides that are in proportion and 1 pair of corresponding angles that are congruent (the angle must be included)

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14
Q

SSS~

A

shows 3 pairs of coorespoding sides that are in proportion

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15
Q

the type of transformation between similar polygons is called a

A

dialation

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