Vocabulary Flashcards
(24 cards)
Collinear points
points that lie on the same line
coplaner points
points that lie on the same plane
straight angle
measures 180 degrees
adjacent angles
two angles that share a vertex and a side, but no common interior points (don’t overlap)
midpoint
point that bisects (divides) a segment into two congruent lines
angle bisector
a ray that divides an angle into two congruent angles
vertical angles
sides form two pairs of opposite rays
linear pair
two adjacent angles whose non-common sides are opposite rays
supplementary angles
two angles whose sum equals 180 degrees
complementary angles
two angles whose sum equals 360 degrees
perpendicular lines
two lines which form a right angle
parallel lines
coplaner lines which do not intersect
skew lines
noncoplaner lines that do not intersect
slope of a line
the ratio of vertical change to horizontal change
rise y2 - y1
—— or ————
run x2 - x1
hypotenuse
the line opposite the right angle in a right triangle
perpendicular bisector
a segment, ray, line, or plane that is perpendicular to a segment at its midpoint
median
a segment whose endpoints are a vertex of the triangle and the midpoint of the opposite side
altitude
the perpendicular segment from a vertex of the triangle to the opposite side OR to the line that contains the opposite side
regular polygon
A four sided polygon that is both equilateral and equiangular
rhombus
parallelogram with four sides, diagonals are perpendicular, Diagonals bisect opposite angles, any quadrilateral with four congruent sides is a rhombus
rectangle
parallelogram with four right angles and diagonals congruent
square
parallelogram with all sides and angles congruent, all properties of a rhombus and rectangle
trapezoid
a quadrilateral with exactly one pair of opposite sides parallel
kite
a quad with two pairs of consecutive congruent sides.
