Across
1
Split into equal parts
3
Closed shape with straight sides
4
Part of a whole number
7
Lines that never intersect
11
Part of a circle's circumference
Down
1
Single numeral from 0 to 9
2
Exact correspondence on both sides
5
Divisible by two
6
Round shape with all points equidistant
8
Number greater than zero
9
System of ordered marks for measuring
10
Mathematical statement of equality
12
Difference between highest and lowest values
13
Proven mathematical statement