Across
1
Longest side of a right triangle
4
Single numeral from 0 to 9
8
Line segment connecting two circle points
10
Value that does not change
11
Parts per hundred
12
Part of a circle's circumference
13
Space between two intersecting lines
14
Amount of space an object occupies
Down
2
Middle value in an ordered dataset
3
The number representing nothing
5
Number greater than zero
6
Repeated addition
7
Symbol representing unknown value
9
Proven mathematical statement