Across
1
Line segment connecting two circle points
2
Rectangle with four equal sides
3
Three-sided polygon
4
Proven mathematical statement
7
Number less than zero
8
Closed shape with straight sides
10
Sum divided by count
Down
2
Exact correspondence on both sides
5
Amount of space an object occupies
6
Comparison of two quantities
9
Number divisible only by 1 and itself
11
Divisible by two