Across
1
Three-sided polygon
5
Value that does not change
6
Steepness of a line
8
Math using letters for unknown values
9
Divisible by two
12
Lines that never intersect
Down
2
Comparison of two quantities
3
Amount of space an object occupies
4
Part of a line with two endpoints
7
Round shape with all points equidistant
10
Closed shape with straight sides
11
Mathematical statement of equality
13
Single numeral from 0 to 9