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# NSA Geometry Ch1

### NSA Geometry Chapter 1

point, line, plane undefined terms
collinear points on the same line are said to be this
coplanar points that lie on the same plane are said to be this
line segment portion of a line with two endpoints
congruent segments segments with the same measure
midpoint point that divides a segment into two congruent segments
segment bisector any segment, line, or plane that intersects a segment at its midpoint
degree unit of measure for an angle
ray part of a line with one endpoint extending indefinitely in one direction
opposite rays two rays that have a common endpoint and form a line
angle formed by two non-collinear rays that have a common endpoint
vertex common endpoint shared by two rays that form an angle
right angle measures 90 degrees
acute angle measures less than 90 degrees
obtuse angle measures between 90 and 180 degrees
congruent angles angles with the same measure
angle bisector ray that divides an angle into two equal angles
adjacent angles two angles in the same plane that share a common vertex and a common side, but no common interior points
vertical angles two nonadjacent angles formed by intersecting lines
linear pair adjacent angles whose non-common sides are opposite rays
complementary angles two angles whose measures have a sum of 90 degrees
supplementary angles two angles whose measures have a sum of 180 degrees
perpendicular lines that form right angles are said to be this
point names a location in space and has no size
perimeter sum of the lengths of the sides of a figure
line a straight path that has no thickness and extends forever
plane a flat surface that has no thickness and extends forever
endpoint a point at one end of a segment or ray
diameter segment that passes through the center of a circle and whose endpoints are on the circle
radius segment whose endpoints are the center of the circle and any point on the circle
circumference distance around a circle
pi irrational number which is the ratio of the circumference and diameter of a circle
Created by: jandslm