Across
1
Part of a circle's circumference
2
Rectangle with four equal sides
4
Line touching circle at one point
5
Line crossing from corner to corner
7
Value that does not change
10
Exact correspondence on both sides
Down
2
System of ordered marks for measuring
3
Result of multiplication
6
Reference line in a graph
8
Number with digits after a point
9
Divisible by two
11
Proven mathematical statement