Across
1
Rectangular array of numbers
3
Proven mathematical statement
4
Closed shape with straight sides
5
U-shaped curve of a quadratic function
6
Number divisible only by 1 and itself
8
Number less than zero
10
Number greater than zero
12
Sum divided by count
Down
1
Middle value in an ordered dataset
2
Power to which a number is raised
3
Three-sided polygon
7
Result of addition
9
Part of a circle's circumference
11
Part of a whole number