Across
1
Number with digits after a point
4
Math using letters for unknown values
5
Amount of space an object occupies
6
Corner point of a polygon
7
Part of a whole number
10
Longest side of a right triangle
Down
2
Symbol representing unknown value
3
Line touching circle at one point
8
The number representing nothing
9
Closed shape with straight sides
11
Part of a line with two endpoints
12
Round shape with all points equidistant
13
Divisible by two