Across
1
Math using letters for unknown values
4
Mathematical rule or equation
5
Part of a line with two endpoints
6
Longest side of a right triangle
7
Line touching circle at one point
9
Reference line in a graph
11
Sum divided by count
Down
2
Closed shape with straight sides
3
Steepness of a line
4
Number that divides evenly into another
8
Corner point of a polygon
10
Round shape with all points equidistant
12
Repeated addition
13
The number representing nothing
14
Rectangle with four equal sides