Geomentry Vocabulary
Point
0 dimensions (no length, no area, no volume)
Line segment
1 dimension (finite length, no area, no volume)
Line
1 dimension (infinite length, no area, no volume)
Ray
1 dimension (infinite length, no area, no volume)
Plane
2 dimensional (infinite length, infinite area, no volume)
Circle
A geometric figure that is made up of an infinite number of points equidistant from one specific point called the center.
Angle
A measurement of two rays or line segments joining at single point.
Reflex angle
An angle that is greater than 180 degrees but less than 360
Obtuse angle
An angle that is more than 90 degrees but less than 180 degrees
Acute angle
Angle less than 90 degrees
Complementary angles
Angles that add up to 90 degrees
Congruent angles
Angles that are mathematically equal
Parallel
Lines that don't intersect
Perpendicular
Lines that intersect at 90 degrees
Polygon
Many-sided (at least 3 sides, closed, sides are line segments, has area, interior angles do not have to have the same measure, and angles don't have to be the same length.)
Equidistant
Points are the same distance from each point
Reflexive
a ∼ a
Straight angle
an angle that is exactly 180 degrees
Right angle
angle exactly 90 degrees
Equiangular
angles are the same distance
supplementary angles
angles that add up to 180 degrees
Vertical angles
angles that are opposite from each other when there's an intersection is congruent
Transitive
if a∼b, and b∼c, then a∼c
Symmetric
if a∼b, then b∼a
Angle bisector
line/point that cuts an angle in half
Midpoint
point in the middle
coplanar
points on the same plane
Collinear
points that are on the same line
Regular polygon
same distance from each point and center
Equilateral
sides are the same length