Vocabulary
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| undefined term | a basic figure not defined in terms of other figures
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| point | an undefined term in Geometry that has no size
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| line | a set of points extending infinitely in two directions
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| plane | a flat surface with no thickness that extends forever
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| collinear | points on the same line
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| coplanar | points on the same plane
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| segment | part of a line with 2 endpoints
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| endpoint | one end of a segment or the starting place for a ray
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| ray | a set of points extending infinitely in 1 direction
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| opposite rays | 2 rays with a common endpoint that form a line
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| postulate | a statement accepted as true without proof
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| coordinate | a point that corresponds to a number
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| distance | the absolute value of the difference in the coordinates
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| length | the distance between 2 points
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| congruent segments | 2 segments with the same length
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| construction | a way to creating a more precise figure, in Geometry we use a compass and straightedge
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| between | B is between A and C if and only if they points are collinear and AB + BC = AC.
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| midpoint | a point that divides a segment into 2 congruent parts
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| bisect | to cut into 2 congruent parts
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| segment bisector | any ray, segment, or line that intersects a segment at its midpoint
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| angle | 2 rays that have a common endpoint
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| vertex | the common endpoint shared by the 2 rays of an angle
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| interior of an angle | the set of all points between the sides of an angle
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| exterior of an angle | the set of all points outside an angle
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| measure | the size of an angle, in degrees
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| degree | 1/360 of a circle
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| acute angle | an angle less than 90 degrees
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| obtuse angle | an angle greater than 90 degrees
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| right angle | an angle that measures exactly 90 degrees
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| straight angle | an angle that measure 180 degrees
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| congruent angles | 2 angles with the same measure
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| angle bisector | any line, segment, or ray that divides an angle into 2 congruent parts
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| adjacent angles | 2 angles that share a common side and vertex
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| linear pair | 2 adjacent angles that form a straight line
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| complementary angles | a pair of angles that have a sum of 90 degrees
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| supplementary angles | a pair of angles that have a sum of 180 degrees
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| vertical angles | 2 angles whose sides form opposite rays
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| coordinate plane | a plane that is divided into 4 regions by a horizontal and vertical axis
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| leg | the sides of a right triangle that form the right angle
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| hypotenuse | the side of a right triangle that is opposite the right angle
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| transformation | the change in the position, size, or shape of a figure
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| preimage | the original figure in a transformation
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| image | the new figure in a transformation
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| reflection | (a flip) a transformation across a line called the line of reflection
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| translation | (a slide)a transformation in which all the points of a figure move the same direction in the same distance
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| rotation | (a turn)a transformation about a point P called a center of rotation
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Created by:
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