Across
1
Split into equal parts
3
The number representing nothing
7
Lines that never intersect
8
Result of raising a number to an exponent
9
Total distance around a shape
12
Number with digits after a point
13
Power to which a number is raised
Down
2
Parts per hundred
4
Three-sided polygon
5
Longest side of a right triangle
6
Reference line in a graph
10
Round shape with all points equidistant
11
U-shaped curve of a quadratic function