Across
1
Value that does not change
5
Steepness of a line
6
Longest side of a right triangle
7
Number divisible only by 1 and itself
9
Mathematical rule or equation
Down
2
System of ordered marks for measuring
3
Repeated addition
4
Space between two intersecting lines
5
Part of a line with two endpoints
7
U-shaped curve of a quadratic function
8
The number representing nothing
10
Math using letters for unknown values