Across
1
Longest side of a right triangle
6
Difference between highest and lowest values
7
Rectangular array of numbers
8
Split into equal parts
9
Number greater than zero
10
Single numeral from 0 to 9
11
Round shape with all points equidistant
Down
2
Proven mathematical statement
3
Line crossing from corner to corner
4
Amount of space an object occupies
5
Three-sided polygon
12
Closed shape with straight sides