Across
1
Total distance around a shape
7
System of ordered marks for measuring
8
Value that does not change
9
Round shape with all points equidistant
Down
2
Repeated addition
3
Mathematical rule or equation
4
Number with digits after a point
5
Result of multiplication
6
Number that divides evenly into another
10
Split into equal parts
11
Distance from center to edge of circle
12
Line segment connecting two circle points
13
Math using letters for unknown values