Across
1
Distance from center to edge of circle
5
Line touching circle at one point
6
Middle value in an ordered dataset
7
Number less than zero
10
Rectangle with four equal sides
12
Number divisible only by 1 and itself
Down
2
Corner point of a polygon
3
Line crossing from corner to corner
4
Repeated addition
8
Single numeral from 0 to 9
9
Power to which a number is raised
10
System of ordered marks for measuring
11
Exact correspondence on both sides