Across
1
Three-sided polygon
5
Collection of distinct elements
6
Amount of space an object occupies
7
Part of a circle's circumference
9
Number that divides evenly into another
11
Part of a whole number
12
Line crossing from corner to corner
Down
2
Comparison of two quantities
3
Proven mathematical statement
4
Number divisible only by 1 and itself
8
Value that does not change
10
Sum divided by count
13
Space between two intersecting lines
14
The number representing nothing