Across
1
Visual representation of data
2
U-shaped curve of a quadratic function
3
Round shape with all points equidistant
4
Symbol representing unknown value
9
Closed shape with straight sides
11
Rectangle with four equal sides
12
The number representing nothing
Down
2
Lines that never intersect
5
Number greater than zero
6
Number divisible only by 1 and itself
7
System of ordered marks for measuring
8
Split into equal parts
9
Total distance around a shape
10
Space between two intersecting lines