All important words in geometry
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| Point | A point is a location with no size or shape
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| Line | A line is made up of points with no thickness or width
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| Line Segment | A measurable part of a line consisting of 2 endpoints
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| Ray | Part of a line that extends indefinitely in one direction
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| Plane | A plane is a flat surface made up of points and expands indefinitely in all directions
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| Collinear | Points that lie on the same line -- non-collinear; points that don't lie on the same lines
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| Coplanar | Points that lie on the same plane -- non-coplanar; points that don't lie on the same plane
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| Congruent Segments | If 2 segments have the same length then they are congruent
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| Segment Addition Postulate | If A, B, and C are collinear points and B is between A and C, then Ab + BC = AC
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| Distance Formula | The formula used to find the distance between the points on a coordinate plane d = square root of (x2 - x1)^2 + (y2 - y1)^2
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| Midpoint formula | The formula used to mind the midpoint between 2 points
M = (x1+x2/2, y1 +y2/2)
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| Segment Bisector | A segment, line, ray; plane that intersects a segment at the midpoint
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| Perpendicular | Two lines that intersect at a 90 degree angle (right angle)
symbol is an upside down T
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| Perpendicular Bisector | A line, segment, or ray perpendicular to a segment at its midpoint
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| Parallel Lines | Two lines that never intersect
symbol: ||
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| Angle | Two rays with a common endpoint
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| Vertex | The common endpoint of an angle
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| Right angle | An angle with a measure of 90 degrees
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| Acute angle | An angle with a measure less than 90 degrees
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| Obtuse angle | An angle with a measure greater than 90 degrees
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| Straight angle | An angle with a measure of 180 degrees
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| Congruent angles | Two angles that have the same measure are congruent
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| Adjacent angles | Two angles that share a vertex and a side
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| Angle addition postulate | If angle ABD and angle DBC are adjacent, then measure of angle ABD + measure of angle DBC = measure of angle ABC
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| Angle bisector | A line or ray that divides an angle into 2 "=" points
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| Vertical angles | Two angles directly across from each other on intersecting lines *always congruent*
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| Complementary angles | 2 angles with measures that sum to 90 degrees "don't have to be adjacent*
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| Supplementary angles | 2 angles with measures that sum to 180 degrees "don't have to be adjacent*
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| Linear pair | Adjacent angles that form a straight line, they are supplementary
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| An angle is formed by 2 ___ with a common endpoint | rays
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| This common endpoint is called the ___ | vertex
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| Name an angle using ___ letters | 3
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| A ray that divides an angle into ___ _____ ____ | 2 congruent angles
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| Two lines that _____ at a _____ ______ | intersect
right angle
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| A line, segment, or ray _______ to a segment is its ______ | perpendicular
midpoint
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