Across
1
Steepness of a line
2
Parts per hundred
3
System of ordered marks for measuring
4
Number that divides evenly into another
6
Space between two intersecting lines
7
Three-sided polygon
Down
2
U-shaped curve of a quadratic function
3
Exact correspondence on both sides
5
Math using letters for unknown values
8
Number divisible only by 1 and itself
9
Split into equal parts