Across
1
Total distance around a shape
4
Symbol representing unknown value
5
Power to which a number is raised
6
Reference line in a graph
10
Part of a circle's circumference
12
Part of a line with two endpoints
Down
2
The number representing nothing
3
System of ordered marks for measuring
4
Amount of space an object occupies
7
Parts per hundred
8
Number divisible only by 1 and itself
9
Lines that never intersect
11
Line crossing from corner to corner
13
Longest side of a right triangle