Across
1
Part of a circle's circumference
3
Middle value in an ordered dataset
6
Symbol representing unknown value
8
Mathematical rule or equation
9
Longest side of a right triangle
10
Divisible by two
11
Part of a whole number
12
Line segment connecting two circle points
Down
2
Number less than zero
3
Rectangular array of numbers
4
U-shaped curve of a quadratic function
5
Number with digits after a point
7
Rectangle with four equal sides