Across
1
System of ordered marks for measuring
3
Line crossing from corner to corner
4
Line touching circle at one point
5
Three-sided polygon
10
Number that divides evenly into another
11
Total distance around a shape
Down
2
Difference between highest and lowest values
3
Number with digits after a point
6
Corner point of a polygon
7
Repeated addition
8
Value that does not change
9
Lines that never intersect