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Algebra 1

STUDY
PLAY
mixed number
A mixed number is the sum of a whole number and a fraction.
intersect
when two lines cross
point of intersection
the place where the lines cross
parallel lines
if two lines in the same plane do not intersect
perpendicular
if two lines make square corners
right angles
angles made by perpendicular lines
straight angle
two right angles
acute angle
an angle smaller than a right angle
obtuse angle
an angle smaller than a right angle
polygon
the number of sides is always equal to the number of vertices
side
each segment of a polygon
vertex {plural: vertices}
endpoint of a side
concave polygon
if a polygon has a indentation
convex polygon
any polygon that does not have an indentation
parallelogram
quadrilateral that has two pairs of parallel sides
trapezoid
is a quadrilateral that has exactly two parallel sides
rhombus
equilateral parallelogram
square
rhombus with four right angles
perimeter
measure around or distance around
radius
distance from the center of the circle
diameter
twice the length of the radius
circumference
perimeter of a circle
circumference of a circle
pi D=pi(2r)=2(pi)r
infinte numbers
(1, 3, 5, 7 ....)
finite numbers
(1, 3, 4, 6 )