Across
1
The number representing nothing
3
Proven mathematical statement
6
Steepness of a line
7
Number greater than zero
8
Result of addition
11
Line crossing from corner to corner
13
Symbol representing unknown value
Down
2
Visual representation of data
4
Result of raising a number to an exponent
5
Longest side of a right triangle
9
Line touching circle at one point
10
Sum divided by count
12
Repeated addition