Across
1
Reference line in a graph
3
Power to which a number is raised
4
Round shape with all points equidistant
8
Single numeral from 0 to 9
9
Line touching circle at one point
10
Longest side of a right triangle
11
Repeated addition
Down
2
Number divisible only by 1 and itself
4
Value that does not change
5
Number with digits after a point
6
Space between two intersecting lines
7
Rectangular array of numbers
12
Mathematical rule or equation