Across
1
The number representing nothing
5
System of ordered marks for measuring
6
Exact correspondence on both sides
7
Mathematical rule or equation
8
Repeated addition
9
Proven mathematical statement
14
Result of multiplication
Down
2
Symbol representing unknown value
3
Distance from center to edge of circle
4
Comparison of two quantities
10
Longest side of a right triangle
11
Round shape with all points equidistant
12
Mathematical statement of equality
13
Number with digits after a point