In algebra, it's a letter or symbol that stands in for an unknown value
a variable
It means to express a fraction in a more basic form, like simplifying 365/730 to 1/2
reduce
Adjective for an angle of less than 90 degrees
acute
For a sphere, this measure is (4/3) pi r3
the volume
Bone up! This element is alphabetically next after cadmium
calcium
Though this vertical line is a basis of the Cartesian coordinate system, Descartes never heard of it
the y-axis
A number that can be made by multiplying digits within it, like 1,260=21 x 60, is this monstrous type; 21 & 60 are the "fangs"
a vampire (number)
It's a number that represents the power to which a base is to be raised
exponent
It's a mathematical expression consisting of 2 parts, as in 2b + 3a
a binomial
As they share a common vertex, angles A & B are said to be this type; note that A is directly on top of B

vertical
The energy an object has by virtue of its motion is this kind, from Greek for "moving"
kinetic
The result of a basic operation, it's from the Latin for "how many times"
a quotient
Velocity is this type of quantity that has both magnitude & direction
a vector
2 sides of an angle meet at this 6-letter point
vertex
From the Greek for "four-sided", it's a geometric solid made up of 4 triangular plane faces
a tetrahedron