Across
1
Corner point of a polygon
4
Line crossing from corner to corner
5
Parts per hundred
7
Mathematical statement of equality
8
Repeated addition
9
Number greater than zero
11
Round shape with all points equidistant
12
Number with digits after a point
Down
2
Part of a whole number
3
Exact correspondence on both sides
6
Three-sided polygon
10
Steepness of a line