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Points, Lines, and Planes
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Gravity
Key Concepts:
Terms in this set (31)
Point
A location in space.
Line
An undefined term in geometry, a straight path that has no thickness and extends forever.
Plane
a flat surface that has no thickness and extends forever
Segment
part of a line with two endpoints
Ray
A part of a line, with one endpoint, that continues without end in one direction
Opposite Rays
two rays that have a common endpoint and form a line
Collinear
points that lie on the same line
Coplanar
points that lie on the same plane
Noncollinear
points that do not lie on the same line
Noncoplanar
points that do not lie on the same plane
Midpoint
A point that divides a segment into two congruent segments
Angle Bisector
a ray that divides an angle into two congruent angles
Segment Bisector
a segment, ray, line, or plane that intersects a segment at its midpoint
adjacent angles
two angles that share a common vertex and side, but have no common interior points
Vertical Angles
two angles whose sides form two pairs of opposite rays
Supplementary angles
Two angles whose sum is 180 degrees
Complementary angles
Two angles whose sum is 90 degrees
Linear pair
A pair of adjacent angles whose noncommon sides are opposite rays.
distance formula
d = √[( x₂ - x₁)² + (y₂ - y₁)²]
midpoint formula
(x₁+x₂)/2, (y₁+y₂)/2
Segment Addition Postulate
If B is between A and C, then AB + BC = AC
Distance on a number line
D= |a-b|
Midpoint on a number line
(a+b)/2
Congruent Segments
segments that have the same measure
Congruent Angles
angles that have the same measure
Midpoint of (3,6) and (9, 16)
(6,11)
Midpoint of (4,16) and (2, -5)
(3,5.5)
A is between B and C, AB=3 and BC=5, What is AC?
AC = 2
B is between A and C, AB=3 and BC = 5, What is AC?
AC = 8
2
The number of points needed to name a segment, line, or ray.
3
The number of points needed to name a plane.
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