Across
1
Amount of space an object occupies
2
Total distance around a shape
3
Steepness of a line
5
Symbol representing unknown value
6
Single numeral from 0 to 9
7
Space between two intersecting lines
Down
2
Number greater than zero
3
System of ordered marks for measuring
4
Divisible by two
8
Proven mathematical statement
9
Part of a line with two endpoints
10
Line crossing from corner to corner
11
Math using letters for unknown values
12
Number with digits after a point