Across
1
Corner point of a polygon
4
Repeated addition
5
Proven mathematical statement
6
System of ordered marks for measuring
8
The number representing nothing
Down
2
Longest side of a right triangle
3
Divisible by two
7
Line touching circle at one point
9
Value that does not change
10
Number divisible only by 1 and itself
11
Sum divided by count
12
Part of a line with two endpoints