Degree of an Angle
A degree is a special unit of
measure that measures things that are circular
-- like angles that sweep around! To
show that a measurement is a degree, you use a
little circle after
the number. |
 |
|
|
 |
Degree of a Polynomial
To find the degree of a
polynomial, just find and count the biggest
exponents.
The green polynomial below is a
3rd degree polynomial because
the biggest power is a cube.
The purple polynomial below has
a degree of 10 since
8+2=10
and that's the biggest one.
For more info, check out my algebra
lesson on
polynomials. |
|
|
|
|
|
|
Diameter
The diameter is a
chord (a line segment)
that passes through the center of the circle.
The diameter also cuts across the thickest part of
the circle.
diameter =
2
x
radius
d =
2r |
 |
|
|
|
Difference
The difference is the answer
you get when you subtract one number from another number.
Example: The difference of
8 and 3
is 5.
For more info, check out my
Subtraction Lessons. |
|
|
Digit
Digits are the numbers we use
for counting: 0,
1,
2,
3,
4,
5,
6,
7,
8,
9 |
|
|
Dihedral Angle
A dihedral angle is the
interior angle formed by two planes -- usually in
three dimensional geometric figures like
polyhedra.
In the picture on the right, you can see a
dihedral angle on the
inside of a
cube.
The dihedral angle is
formed by the bottom face
and the left side.
To find the dihedral angles
for the different Platonic solids and semi-regular
Platonic solids, check out my
Polyhedra Gallery. |
 |
|
|
|
Distributive Property of Arithmetic and Algebra
The distributive property of
arithmetic and algebra is a math rule
that is always true. Here it is with letters:
a
( b
+ c
) = ab
+ ac
This property is giving you instruction on how to deal with
those parenthesis. Remember that you always do what's
in the parenthesis ( )
first... But, in Algebra, you may not be able to add
the b and the
c... So, this
property tells you what to do... You distribute the
a to the
b and, then you distribute the
a to the c.
Here it is with numbers so you
can check this for yourself!
2
( 3
+ 4
) = 2x3
+ 2x4
Remember your order of operations: Parenthesis, then
multiplication, then addition! |
|
|
Dividend
In a division problem, the
dividend is the number you are
dividing INTO. In the problem below, the
6 is the dividend.
For more info, check out my
Division Lessons. |
|
|
Divisor
In a division problem, the
divisor is the number you are
dividing BY. In the problem below, the
3 is the divisor.
For more info, check out my
Division Lessons. |
|
|
|
|
|
|
Dodecahedron
A dodecahedron is a 3
dimensional geometric figure (a
polyhedron) that is
made up of 12 regular pentagons. The
dodecahedron is one of five very famous objects called
The Platonic Solids.
Properties of the
dodecahedron:
12 faces: regular pentagons
20 vertices
30 edges
Dihedral angle:
about 116.56 degrees
For more info about
Platonic solids, check out my
Platonic solids gallery. |
 |
|
