quadratic equation an equation in the form
ax 2
+
bx +
c = 0, where
a ,
b , and
c are numbers and
a ≠
0
quadratic trinomial an expression that contains an
x 2
term as well as an
x term
quadrilateral a four-sided polygon
quotient the result of dividing two or more numbers
radical the symbol used to signify a root operation;
radicand the number inside of a radical
radius a line segment inside a circle with one point on the radius and the other point at the center on the circle.
The radius is half the diameter. This term can also be used to refer to the length of such a line segment. The
plural of
radius is
radii .
range all the solutions to
f (
x ) in a function
ratio a comparison of two quantities measured in the same units
rational numbers all numbers that can be written as fractions, terminating decimals, and repeating decimals
ray half of a line. A ray has one endpoint and continues infinitely in one direction. The geometric notation for
a ray with endpoint
A and passing through point
B is
AB .
reciprocals two numbers whose product is 1.
5
4
is the reciprocal of
4
5
.
rectangle a parallelogram with four right angles
regular polygon a polygon with all equal sides
rhombus a parallelogram with four equal sides
right angle an angle that measures exactly 90°
right triangle a triangle with an angle that measures exactly 90°
