Across
1
Proven mathematical statement
5
Amount of space an object occupies
6
Sum divided by count
7
Closed shape with straight sides
8
Difference between highest and lowest values
9
Line touching circle at one point
10
Reference line in a graph
Down
2
Rectangle with four equal sides
3
Exact correspondence on both sides
4
Repeated addition
5
Symbol representing unknown value
6
Part of a circle's circumference
11
Line crossing from corner to corner