Across
1
Line crossing from corner to corner
5
Collection of distinct elements
6
Rectangle with four equal sides
7
Closed shape with straight sides
9
Total distance around a shape
12
Sum divided by count
13
Corner point of a polygon
Down
2
Number less than zero
3
Proven mathematical statement
4
Lines that never intersect
7
Number divisible only by 1 and itself
8
Value that does not change
10
Power to which a number is raised
11
Comparison of two quantities
14
Amount of space an object occupies