Across
1
Rectangle with four equal sides
3
Line crossing from corner to corner
5
Amount of space an object occupies
6
Corner point of a polygon
9
Mathematical statement of equality
10
Reference line in a graph
11
Number greater than zero
Down
1
Steepness of a line
2
Symbol representing unknown value
4
Three-sided polygon
7
Mathematical rule or equation
8
The number representing nothing