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# Polygons Vocab.

### Polygons and Quadrilaterals vocabulary (Geometry - Mrs. Davis)

termdefinition
acute angle angle less than ninety degrees
acute triangle triangle with all angles less than ninety degrees
angle two rays with a common endpoint
complementary adjective describing two angles whose sum is ninety degrees
congruent adjective describing figures with the same shape and size
decagon ten-sided polygon
degree unit of measure for angles (the most common)
dilation a type of transformation: the process of reducing or enlarging a figure
inductive reasoning a rule based on a pattern of several examples
deductive reasoning reasoning in which the conclusion is reached from previously known facts
equilateral all sides of a figure are congruent
heptagon seven-sided polygon
hexagon six-sided polygon
indirect measurement Indirect measurement is a technique that uses proportions to find a measurement when direct measurement is not possible.
inscribed polygon a polygon whose vertices rest on the circle
isosceles adjective for a polygon with two congruent sides
line of symmetry the fold line between two halves that mirror each other
line symmetry figures that match exactly when folded in half have line symmetry
nonagon nine-sided polygon
obtuse angle an angle measuring more than nintey degrees but less than 180 degrees
obtuse triangle a triangle containing one obtuse angle
octagon eight-sided polygon
pentagon five-sided polygon
polygon a simple closed figure formed by three or more line segments
simple adjective meaning that line segments do not cross each other
protractor a tool used to measure angles
reflection a mirror image of a figure across a line of symmetry
regular polygon a polygon with all sides congruent and all angles congruent