Across
1
Lines that never intersect
5
Divisible by two
6
System of ordered marks for measuring
7
Number greater than zero
8
Math using letters for unknown values
9
Repeated addition
11
Number less than zero
Down
1
U-shaped curve of a quadratic function
2
The number representing nothing
3
Proven mathematical statement
4
Three-sided polygon
6
Part of a line with two endpoints
10
Middle value in an ordered dataset
12
Parts per hundred
13
Space between two intersecting lines