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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| line segment | consists of two endpoints and all the points that lie on a line between those two endpoints
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| ray | consists of an initial point and all the points on a line to one side of that point; a half line
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| opposite rays | two rays that share the same initial point and form a straight line
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| collinear points | points that are on the same line
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| angle | consists of two different rays that have the same initial point
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| acute angle | an angle with a measure greater than 0 degrees and less than 90 degrees
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| right angle | an angle with a measure of 90 degrees
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| obtuse angle | an angle with a measure greater than 90 degrees and less than 180 degrees
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| straight angle | an angle that measures 180 degrees
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| adjacent angles | two angles that share a common vertex and side, but have no common interior points
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| congruent segments | segments that have the same length
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| congruent angles | angles that have the same measure
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| midpoint of a segment | the point that divides the segment into two congruent segments
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| segment bisector | a segment, ray, line, or plane that intersects a segment at its midpoint
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| angle bisector | a ray that divides the angle into two congruent angles
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| perpendicular lines | two lines that intersect to form a right angle
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| conditional statement | a statement made up of two parts, the hypothesis (if p) and the conclusion (then q)
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| converse of a conditional statement | formed by interchanging the hypothesis and the conclusion
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| counterexample | an example of a conditional statement in which the hypothesis is fulfilled and the conclusion is not fulfilled proving the statement to be false
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| biconditional statement | p if and only if q; equivalent to writing p implies q and q implies p
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| vertical angles | angles whose sides form two pairs of opposite rays
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| linear pair | two adjacent angles whose noncommon sides form opposite rays
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| complementary angles | two angles whose sum equals 90 degrees
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| supplementary angles | two angles whose sum equals 180 degrees
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| parallel lines | coplanar lines that do not intersect
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| intersecting lines | coplanar lines that have exactly one point in common
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| oblique lines | intersecting lines that are not perpendicular
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| coincident lines | the same line
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| contrapositive of p implies q | not q implies not p; true if and only if p implies q is true
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| Law of Syllogism | p implies q, q implies r, therefore p implies r
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| Law of Detatchment | p implies q, p is true, therefore q is true
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| transversal | a line that intersects two or more coplanar lines at different points
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| corresponding angles | angles that occupy corresponding positions when a transversal intersects two lines
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| alternate interior angles | two angles that lie between two lines intersected by a transversal and on opposite sides of the transversal
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| consecutive interior angles | two angles that lie between two lines intersected by a transversal on the same side of the transversal
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| skew lines | lines that do not lie in the same plane
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| vector | a quantity that has both quantity and magnitude
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| parallel vectors | vectors that have the same or opposite direction
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| congruent triangles | triangles whose corresponding angles and sides are congruent
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| equilateral triangle | a triangle with three congruent sides
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| isosceles triangle | a triangle with at least two congruent sides
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| scalene triangle | a triangle with no congruent sides
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| acute triangle | a triangle with three acute angles
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| rignt triangle | a triangle with one right angle
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| obtuse triangle | a triangle with exactly on obtuse angle
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| equiangular triangle | a triangle with three congruent angles
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| legs | the sides of a right triangel that form the right angle; the two congruent sides in an isosceles triangle
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| hypotenuse | the side opposite the right angle in a right triangle
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| base | the noncongruent side in an isosceles triangle
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| interior angles of a triangle | the angles inside the triangle
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| exterior angles of a triangle | the angles adjacent to the interior angles
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Created by:
lrgmath
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