Across
1
Round shape with all points equidistant
3
Result of addition
5
Total distance around a shape
6
Longest side of a right triangle
7
Corner point of a polygon
9
Line touching circle at one point
10
System of ordered marks for measuring
Down
2
Result of multiplication
3
Exact correspondence on both sides
4
Sum divided by count
8
The number representing nothing
11
Number greater than zero
12
Space between two intersecting lines