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Vocab words for math test

point location
line 2 or more points (on a line) that extends forever in both directions
plane flat surface with 3 or less points
co-linear points points on same line
co-planar points points on same plane
line segment can be measure and has endpoints
ray part of a line that goes forever in one direction
opposite rays 2 rays with same endpoint and go forever in opposite directions
angle 2 non co-linear rays with common endpoint
vertex common endpoint of an angle
obtuse angle greater than 90 degrees less than 180 degrees
acute angle less than 90 degrees greater than 0 degrees
right angle exactly 90 degrees
straight angle exactly 180 degrees
adjacent angles angles that share an endpoint and a side
angle bisector ray that divides an angle into 2 congruent angles
segment bisector segment line or plane that intersects at a segments midpoint and forms 2 congruent segments
vertical angles 2 nonadjacent angles formed by 2 intersecting lines and are congruent
linear pair 2 adjacent angles that create a 180 degree angle
complementary angles 2 angles sum to 90 degrees
supplementary angles 2 angles sum to 180 degrees
counterexample example that shows a statement is false
theorem statement as a result of other true statements
postulate rules accepted without proof
conjecture unproven statement based on observations
congruent same exact size shape and/or measure
midpoint divides segment into 2 congruent segments
area square units that cover a surface
circumference distance around circle
degree measure angles and arcs
volume space a 3-D figure fills
surface area sum of all face and side areas
perimeter sum of lengths of all sides of a figure
parallel lines with same slope
perpendicular lines with opposite reciprocal slope
Created by: edenbreslauer