Across
1
Split into equal parts
4
Symbol representing unknown value
7
Divisible by two
9
Longest side of a right triangle
10
Result of addition
11
Steepness of a line
15
Repeated addition
Down
2
Number divisible only by 1 and itself
3
Line segment connecting two circle points
5
Space between two intersecting lines
6
Mathematical statement of equality
8
Sum divided by count
12
Visual representation of data
13
Reference line in a graph
14
Lines that never intersect