Across
1
Split into equal parts
2
Steepness of a line
4
Proven mathematical statement
5
Value that does not change
7
Power to which a number is raised
8
Part of a line with two endpoints
Down
2
Rectangle with four equal sides
3
Mathematical statement of equality
6
Total distance around a shape
9
Single numeral from 0 to 9
10
Line crossing from corner to corner
11
System of ordered marks for measuring
12
Parts per hundred