Across
1
Number greater than zero
4
Exact correspondence on both sides
5
Space between two intersecting lines
6
Three-sided polygon
8
Number with digits after a point
9
Proven mathematical statement
Down
2
Rectangular array of numbers
3
Repeated addition
4
Collection of distinct elements
7
Difference between highest and lowest values
10
Number less than zero
11
Distance from center to edge of circle