Across
1
Part of a whole number
3
Rectangle with four equal sides
5
The number representing nothing
6
Round shape with all points equidistant
8
Space between two intersecting lines
10
Rectangular array of numbers
11
Corner point of a polygon
Down
2
Mathematical statement of equality
3
Steepness of a line
4
Line crossing from corner to corner
7
Closed shape with straight sides
9
Sum divided by count