Across
1
Number greater than zero
3
Number with digits after a point
6
Rectangle with four equal sides
7
Lines that never intersect
8
Proven mathematical statement
9
System of ordered marks for measuring
13
Total distance around a shape
Down
2
Exact correspondence on both sides
3
Single numeral from 0 to 9
4
Longest side of a right triangle
5
Sum divided by count
10
Mathematical rule or equation
11
Amount of space an object occupies
12
Difference between highest and lowest values