How can we help?

You can also find more resources in our Help Center.

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 )