Across
1
Line segment connecting two circle points
2
System of ordered marks for measuring
3
Power to which a number is raised
7
Total distance around a shape
8
Value that does not change
9
Symbol representing unknown value
Down
1
Round shape with all points equidistant
4
Corner point of a polygon
5
Number less than zero
6
Line crossing from corner to corner
10
Rectangular array of numbers
11
Steepness of a line
12
Number that divides evenly into another