Across
1
Math using letters for unknown values
4
Total distance around a shape
5
Number that divides evenly into another
6
System of ordered marks for measuring
9
Lines that never intersect
10
Three-sided polygon
Down
2
Steepness of a line
3
Comparison of two quantities
4
Number divisible only by 1 and itself
7
Space between two intersecting lines
8
Distance from center to edge of circle