Across
1
Number divisible only by 1 and itself
4
Result of raising a number to an exponent
5
Number with digits after a point
6
Corner point of a polygon
7
Lines that never intersect
9
Power to which a number is raised
11
Part of a circle's circumference
13
Three-sided polygon
Down
2
Comparison of two quantities
3
Round shape with all points equidistant
4
Result of multiplication
8
Symbol representing unknown value
10
Split into equal parts
12
The number representing nothing