Across
1
Steepness of a line
5
Part of a circle's circumference
6
Total distance around a shape
7
Single numeral from 0 to 9
8
Result of multiplication
9
Number that divides evenly into another
12
Mathematical statement of equality
Down
2
Longest side of a right triangle
3
Value that does not change
4
System of ordered marks for measuring
10
Line crossing from corner to corner
11
Number less than zero