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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