Across
1
Amount of space an object occupies
4
Lines that never intersect
5
Round shape with all points equidistant
6
Rectangle with four equal sides
7
Reference line in a graph
8
Parts per hundred
9
Single numeral from 0 to 9
10
Space between two intersecting lines
12
Line crossing from corner to corner
Down
1
Symbol representing unknown value
2
Longest side of a right triangle
3
Mathematical statement of equality
11
Sum divided by count