Across
1
Number less than zero
5
Rectangle with four equal sides
6
Number with digits after a point
7
Total distance around a shape
8
Result of multiplication
10
Difference between highest and lowest values
11
Corner point of a polygon
Down
2
U-shaped curve of a quadratic function
3
The number representing nothing
4
Distance from center to edge of circle
5
Part of a line with two endpoints
6
Split into equal parts
9
Longest side of a right triangle
12
Line segment connecting two circle points
13
Math using letters for unknown values