Across
1
The number representing nothing
3
Difference between highest and lowest values
4
Line touching circle at one point
7
Longest side of a right triangle
8
Value that does not change
11
System of ordered marks for measuring
Down
2
Math using letters for unknown values
5
Power to which a number is raised
6
Number greater than zero
9
Distance from center to edge of circle
10
Corner point of a polygon
12
Line segment connecting two circle points
13
Rectangular array of numbers