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Geometry - Measurement Unit

Terms in this set (39)

UNDEFINED TERMS
point, line, plane
PLANE
flat surface
LINE
goes on forever in both directions
LINE SEGMENT
has 2 endpoints
RAY
has 1 endpoint and goes on forever in 1 direction
COLLINEAR
points on the same line
NONCOLLINEAR
points NOT on the same line
COPLANAR
points on the same plane
NONCOPLANAR
points NOT on the same plane
INTERSECTION
when things cross each other
INTERSECTION OF LINES
two lines intersect at a point
INTERSECTION OF PLANES
two planes intersect at a line
CONGRUENT
Same shape & size
CONGRUENT SEGMENTS
segments with the same length (tick marks show they are equal)
SEGMENT ADDITION POSTULATE
one small piece + another small piece = big piece
BISECT
Cut in Half
DISTANCE FORMULA
How far points are from each other (Find AB)
MIDPOINT FORMULA
"Average" or middle of the line segment
ANGLE
opposite rays that share a common endpoint
VERTEX OF AN ANGLE
where the two legs of an angle intersect
INTERIOR OF AN ANGLE
"inside" of the angle
EXTERIOR OF AN ANGLE
"outside" of the angle
ACUTE ANGLE
an angle that measures less than 90
RIGHT ANGLE
angle measure of 90
OBTUSE ANGLE
angle measure greater than 90 but less than 180
STRAIGHT ANGLE
angle measure of 180
ANGLE ADDITION POSTULATE
one small angle + another small angle = big angle
ANGLE BISECTOR
a ray that cuts an angle in half
CONGRUENT ANGLES
angles with equal measures
ADJACENT ANGLES
angles with a shared vertex and leg (angles that are next to each other)
LINEAR PAIR
adjacent angles that from a line
VERTICAL ANGLES
non adjacent angles formed by 2 intersecting lines (opposite each other)
COMPLEMENTARY ANGLES
two angles that have a sum of 90
SUPPLEMENTARY ANGLES
two angles that have a sum of 180
PARALLEL LINES
Lines that never intersect
PARALLEL PLANES
Planes that never intersect
PERPENDICULAR LINES
Lines that intersect and form 4 right angles
PERPENDICULAR PLANS
Planes that intersect and form right angles
SKEW LINES
Lines that are noncoplanar and never intersect (also aren't parallel)
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