Across
1
Sum divided by count
6
Proven mathematical statement
7
Result of multiplication
8
Rectangular array of numbers
9
Lines that never intersect
11
Steepness of a line
12
Closed shape with straight sides
13
Line touching circle at one point
Down
2
Three-sided polygon
3
Total distance around a shape
4
Reference line in a graph
5
Result of raising a number to an exponent
10
Number with digits after a point