Across
1
Math using letters for unknown values
2
Collection of distinct elements
4
U-shaped curve of a quadratic function
6
Mathematical statement of equality
7
Number greater than zero
8
Line crossing from corner to corner
9
Line touching circle at one point
Down
2
System of ordered marks for measuring
3
The number representing nothing
4
Lines that never intersect
5
Single numeral from 0 to 9
10
Closed shape with straight sides