Across
1
Longest side of a right triangle
7
Number greater than zero
8
Collection of distinct elements
9
Symbol representing unknown value
Down
2
Math using letters for unknown values
3
The number representing nothing
4
Number with digits after a point
5
Result of raising a number to an exponent
6
Amount of space an object occupies
10
Result of addition
11
Rectangular array of numbers
12
Sum divided by count