Across
1
Three-sided polygon
5
Number divisible only by 1 and itself
7
Split into equal parts
8
Line crossing from corner to corner
9
Round shape with all points equidistant
11
Math using letters for unknown values
Down
2
Number less than zero
3
Number that divides evenly into another
4
Divisible by two
6
Lines that never intersect
10
Single numeral from 0 to 9
12
Difference between highest and lowest values