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NSA Geometry Ch1
NSA Geometry Chapter 1
Question | Answer |
---|---|
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 |