Across
1
Number less than zero
6
Closed shape with straight sides
7
Single numeral from 0 to 9
8
Number divisible only by 1 and itself
13
Divisible by two
14
Value that does not change
15
Part of a circle's circumference
Down
2
Sum divided by count
3
Line touching circle at one point
4
Steepness of a line
5
Split into equal parts
9
Part of a line with two endpoints
10
Three-sided polygon
11
Rectangle with four equal sides
12
Visual representation of data