Across
1
Line segment connecting two circle points
3
Symbol representing unknown value
5
Repeated addition
6
System of ordered marks for measuring
8
The number representing nothing
11
Math using letters for unknown values
Down
2
Total distance around a shape
4
Result of multiplication
7
Number that divides evenly into another
9
Space between two intersecting lines
10
Rectangular array of numbers
12
Part of a circle's circumference
13
Mathematical rule or equation