 Shuffle Toggle OnToggle Off
 Alphabetize Toggle OnToggle Off
 Front First Toggle OnToggle Off
 Both Sides Toggle OnToggle Off
 Read Toggle OnToggle Off
Reading...
How to study your flashcards.
Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key
Up/Down arrow keys: Flip the card between the front and back.down keyup key
H key: Show hint (3rd side).h key
A key: Read text to speech.a key
Play button
Play button
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
