Across
1
Longest side of a right triangle
6
Difference between highest and lowest values
8
Value that does not change
9
Lines that never intersect
10
Rectangular array of numbers
12
Symbol representing unknown value
13
Rectangle with four equal sides
Down
2
Result of multiplication
3
Result of raising a number to an exponent
4
Reference line in a graph
5
Proven mathematical statement
7
Sum divided by count
11
Repeated addition