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Math terms 9/21

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point
an exact location in space
line
an infinite set of points forming a straight path extending in opposite directions
line segment
a part of a line that consists of the two endpoints and all the points of the line between them
ray
a part of a line that has one endpoint and extends infinitely in one direction
midpoint
the point on a line segment that divides it into two equal segments
angle
the union of two rays that share a common endpoint
plane
a flat surface with infinite lengthe and width but no thickness
collinear
on the same line
perpindicular lines
lines that intersect to form a right angle
parallel lines
lines in the same plane that do not intersect
supplementary angles
two angles with measures whose sum is 180 degrees
interior angle
An angle on the inside of a polygon, formed by the sides of the polygon (see GSP3
Exterior angle
: An angle formed by the side of a polygon and an extension of an adjacent side. At each vertex, there are two exterior angles (see GSP3
Adjacent angles
Angles that share a common ray and endpoint, but that do not overlap
Linear pair
A linear pair of angles is formed when two lines intersect. The angles are adjacent and formed by the two intersecting lines. Below, and are a linear pair
vertex
The common endpoint of two rays or segments (plural: vertices)
Polygon
A closed figure formed by line segments that meet only at their endpoints
Regular polygon
A polygon that has all sides congruent and all angles congruent.
Triangle
A three-sided polygon
Quadrilateral
A four-sided polygon
Pentagon
A five-sided polygon
Hexagon
A six-sided polygon
Septagon
A seven-sided polygon
Octagon
An eight-sided polygon
Nonagon
A nine-sided polygon
Decagon
A ten-sided polygon
Interior angle
An angle on the inside of a polygon, formed by the sides of the polygon (see GSP 3
Exterior angle
An angle formed by the side of a polygon and an extension of an adjacent side. (see GSP
Linear pairs are supplementary
Linear pairs are supplementary
The sum of the interior angles of a convex polygon with n sides is 180(n - 2)0
The sum of the interior angles of a convex polygon with n sides is 180(n - 2)0
The sum of the exterior angles of all convex polygons is 3600
The sum of the exterior angles of all convex polygons is 3600