Across
1
Space between two intersecting lines
2
Collection of distinct elements
4
Parts per hundred
5
Three-sided polygon
7
Closed shape with straight sides
8
Difference between highest and lowest values
11
Repeated addition
Down
2
Rectangle with four equal sides
3
Steepness of a line
6
Middle value in an ordered dataset
9
Number divisible only by 1 and itself
10
Proven mathematical statement