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20 terms

Geometry (Part 1)

Transformations and Similar Figures
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congruent
figures with same size and shape
corresponding parts
a pair of sides or angles in the same position on similar figures
reflectional symmetry
when a figure can be folded on a given line that divides it into two congruent parts
reflection
a flip across a given line
rotation
a turn around a given point with a given angle and direction
rotational symmetry
when a figure can be turned around a central point less than 360 degrees and it matches up with the original image
transformation
a change in the size or position of a figure
translation
movement of a figure along a straight line
similar figures
have the same shape but are not the same size
scale factor
a ratio used to enlarge or reduce similar figures
dilation
a transformation that changes the size of an image but not the shape.
ratio
a comparison of two numbers by division
proportion
an equation that states that two ratios are equal
rate
a ratio of two quantities with different units
enlargement
an increase in size of all dimensions in the same proportions and have a scale factor > 1
reduction
a decrease in size of all dimensions in the same proportion and have a scale factor < 1
unit rate
a rate simplified so the denominator is 1 (mpg, cost/item)
cross products
used to solve proportions or compare two ratios
indirect measurement
uses similar figures and proportions to find a missing measurement
scale
the ratio of a distance in a drawing to the actual distance