Across
1
Closed shape with straight sides
4
The number representing nothing
5
Rectangle with four equal sides
6
Sum divided by count
8
Number divisible only by 1 and itself
9
Line segment connecting two circle points
13
Symbol representing unknown value
14
Lines that never intersect
Down
2
Middle value in an ordered dataset
3
Amount of space an object occupies
7
U-shaped curve of a quadratic function
10
Power to which a number is raised
11
System of ordered marks for measuring
12
Part of a whole number