Across
1
Amount of space an object occupies
2
Lines that never intersect
3
Exact correspondence on both sides
4
Collection of distinct elements
6
Value that does not change
8
Symbol representing unknown value
11
Power to which a number is raised
Down
2
Parts per hundred
4
System of ordered marks for measuring
5
Line crossing from corner to corner
7
Part of a line with two endpoints
9
Difference between highest and lowest values
10
Number less than zero
12
Part of a circle's circumference