Across
1
Space between two intersecting lines
5
Total distance around a shape
6
Collection of distinct elements
9
Comparison of two quantities
12
Sum divided by count
14
Result of multiplication
15
Part of a whole number
Down
2
Line touching circle at one point
3
Number less than zero
4
Number divisible only by 1 and itself
7
Number with digits after a point
8
The number representing nothing
10
Proven mathematical statement
11
System of ordered marks for measuring
13
Result of raising a number to an exponent