acute
angle
an angle that
measures greater
than 0 and less
than 90 degrees
obtuse
angle
an angle that
measures greater
than 90 and less
than 180 degrees
right
angle
an angle that
measures
exactly 90
degrees
straight
angle
an angle that
measures
exactly 180
degrees
reflex
angle
an angle that
measures greater
than 180 and less
than 360 degrees
coordinate
grid
a device for locating
points in a plane
using ordered
number pairs, or
coordinates
ordered
number
pair
two numbers that are used to
locate a point on a coordinate
grid. The first number gives the
position along the horizontal
(x-axis) and the second number
gives the position along the
vertical (y-axis). Coordinates
are written like (3,2).
protractor
a tool used for
measuring or
drawing angles
quotient
the answer
to a division
problem
vertex
the point at
which the rays
of an angle
meet