Across
1
Divisible by two
2
Number divisible only by 1 and itself
5
Steepness of a line
6
Lines that never intersect
7
Exact correspondence on both sides
8
Distance from center to edge of circle
9
Number greater than zero
Down
2
Closed shape with straight sides
3
Three-sided polygon
4
Mathematical statement of equality
10
Symbol representing unknown value
11
System of ordered marks for measuring
12
Part of a circle's circumference