Across
1
Three-sided polygon
5
System of ordered marks for measuring
6
Single numeral from 0 to 9
7
The number representing nothing
8
Amount of space an object occupies
9
Total distance around a shape
11
Distance from center to edge of circle
Down
1
Proven mathematical statement
2
Reference line in a graph
3
Mathematical statement of equality
4
Sum divided by count
10
Result of raising a number to an exponent
12
Number greater than zero
13
Number divisible only by 1 and itself