Math Word of the Day comes from the Math Dictionary written by Mathnasium.
Diagonal
Sunday, December 20
A line segment joining two nonadjacent vertices of a polygon.
From the Latin dia- (across) and -gon (angle): literally, "across from angle to angle."

Diagram
Monday, December 21
A picture designed to demonstrate or explain how something works or to clarify the relationship between the parts of a whole.

Diameter
Tuesday, December 22
The distance across a circle. The chord of a circle that passes through the center.

Dichotomy
Wednesday, December 23
The division into two usually mutually exclusive parts.

Difference
Thursday, December 24
The answer to a subtraction question.

Digit
Friday, December 25
Any one of the ten Hindu-Arabic symbols: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.
In general, any numeric symbol less than the base of the number system.

Dilation
Saturday, December 26
A transformation that either enlarges or reduces a geometric figure proportionately.
