Across
1
Line crossing from corner to corner
5
Result of raising a number to an exponent
6
Power to which a number is raised
9
The number representing nothing
10
System of ordered marks for measuring
12
Sum divided by count
Down
2
Part of a line with two endpoints
3
Line touching circle at one point
4
Distance from center to edge of circle
7
Value that does not change
8
Corner point of a polygon
10
Rectangle with four equal sides
11
Total distance around a shape