Similarity Chapter 6

Proportional Sides

(n.) corresponding sides with lengths that form equal ratios

polygon

A closed plane figure made up of line segments

Scale factor

A factor by which a figure is enlarged or reduced.

perpendicular

Intersecting at or forming right angles

Similar figures

Same shape but not necessarily the same size

perimeter

The distance around the border of the figure.

Congruent

Two figures that have the same shape and size.

ratio

a comparison of two numbers by definition

image

a copy of a figure

image

a copy of an object formed by reflected or refracted rays of light

CAPS

a good way to remember that to be similar, a figure has corresponding angles AND proportional sides

vertex

an angle in a polygon

degrees

how an angle is measured

Corresponding angles

matching angles in similar shapes, which have equal measures

Corresponding sides

matching sides of two similar figures

length

the longest side

dimensions

the measurements of a polygon such as length and width

width

the shortest side

double

to use a scale factor of 2

triple

to use a scale factor of 3

quadruple

to use a scale factor of 4

proportion

two ratios set equal to each other