Across
1
Space between two intersecting lines
3
Visual representation of data
5
Closed shape with straight sides
6
Symbol representing unknown value
7
The number representing nothing
8
Collection of distinct elements
9
Mathematical statement of equality
Down
2
Longest side of a right triangle
4
Parts per hundred
10
Repeated addition
11
Line segment connecting two circle points
12
Rectangle with four equal sides
13
Line crossing from corner to corner