Across
1
Collection of distinct elements
3
Result of addition
4
Exact correspondence on both sides
6
Number divisible only by 1 and itself
7
Part of a whole number
10
Three-sided polygon
Down
2
Proven mathematical statement
3
System of ordered marks for measuring
5
Number with digits after a point
8
Split into equal parts
9
Number greater than zero
11
Part of a circle's circumference
12
Line touching circle at one point