Across
1
Mathematical statement of equality
6
Corner point of a polygon
8
Part of a circle's circumference
10
Mathematical rule or equation
11
Result of addition
12
U-shaped curve of a quadratic function
13
Exact correspondence on both sides
14
Single numeral from 0 to 9
Down
2
Sum divided by count
3
Repeated addition
4
The number representing nothing
5
Result of multiplication
7
Number less than zero
9
Rectangular array of numbers