Across
1
Symbol representing unknown value
5
Round shape with all points equidistant
6
Amount of space an object occupies
7
Exact correspondence on both sides
9
Result of addition
Down
2
Number divisible only by 1 and itself
3
Three-sided polygon
4
Mathematical statement of equality
8
Steepness of a line
10
Space between two intersecting lines
11
Corner point of a polygon