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48 Cards in this Set
 Front
 Back
point

a position in space


line

an infinite continuous set of points extending in opposite directions forming a straight path


plane

a flat surface containing a set of points extending infinitely in all directions


collinear

points that lie on the same line


coplanar

points that lie on the same plane


ray

the part of a line that consists of a point, called an endpoint, and the set of points on one side of the endpoint


line segment

a part of a line that consist of two different points on the line, called endpoints, and the set of points on the line that is between them. it has a definite length


postulate

a statement that is assumed to be true without proof


theorem

a statement that can be proven by deductive reasoning


congruent

two figures that have the same size and shape


angle

the union of two rays that share a common endpoint


vertex of an angle

the intersection of two rays of an angle


bisector

a line, ray, or lene segment that divides an angle or line segment into two parts that have the same measure


adjacent angles

two coplanar angles that share a common vertex and a common side but have no interior points in common (do not overlap)


supplementary angles

two angles whose degree measures add up to 180 degrees


complementary angles

two angles whose degree measures add up to 90 degrees


straight angle

any angle whose degree measure is 180 degrees


midpoint

the point that divides a line segment into two congruent segments


perpendicular lines

two lines that intersect to form right angles


perpendicular bisector

a line that is perpendicular to a line segment intersecting the line segment at its midpoint


polygon

a closed figure formed by coplanar line segments that are joined at their midpoints.


regular polygon

a polygon whose sides and angles are all congruent


triangle

a polygon that has exactly three sides


acute triangle

a triangle whose angles are les than 90 degrees


right triangle

a triangle with one right angle and two acute angles


hypotenuse

the side of a triangle that is opposite the right angle


leg

the two sides of a right triangle that form the right angle, or the two congruent sides of an isosceles triangle


obtuse triangle

a triangle that has one angle that is greater than 90 degrees.


equilateral triangle

a triangle whose sides and angles are congruent


isosceles triangle

a triangle with two congruent sides


base angles

the angles in an isoscles triangle that are opposite the legs


vertex angle

the angle in an isosceles triangle that is formed by the two congruent sides. it is opposite the base


scalene triangle

a triangle with no congruent sides or angles


altitude of a triangle

the line segment drawn from the vertex of a triangle that is perpendicular to the opposite side


median of a triangle

the line segment drawn from a vertex of a triangle to the midpoint of the opposite side


quadrilateral

a four sided polygon


parallelogram

a quadrilateral whose opposite sides are parallel


rectangle

a parallelogram consisting of four right angles


rhombus

a parallelogram with four congruent sides


square

a parallelogram containing four congruent sides and four right angles


trapezoid

a quadrilateral with only one pair of parallel sides


isosceles trapezoid

a trapezoid whose nonparallel sides are congruent


alternate interior angles

a pair of angle with differnt vertices that lie between two lines and on opposite sides of a transversal


transversal

a line that intersects two other lines in two different points


vertical angles

the opposite pairs of congruent angles that are formed when two lines intersect


corresponding angles

a pair of angles consisting of one iterior angle and one exterior angle with different vertices on the same side of a transversal.


alternate exterior angles

a pair of angles with different vertices that lie outside two lines and on opposite sides os a transversal


parallel lines

lines that lie on the same plane and do not intersect
