Across
1
Closed shape with straight sides
3
Collection of distinct elements
6
Part of a whole number
7
Symbol representing unknown value
8
Three-sided polygon
11
Divisible by two
Down
2
Power to which a number is raised
4
Parts per hundred
5
Part of a line with two endpoints
9
Math using letters for unknown values
10
Exact correspondence on both sides
12
Amount of space an object occupies