Across
1
U-shaped curve of a quadratic function
3
Single numeral from 0 to 9
6
Part of a whole number
7
Lines that never intersect
9
Total distance around a shape
10
Round shape with all points equidistant
13
Line crossing from corner to corner
Down
2
Symbol representing unknown value
4
Amount of space an object occupies
5
Math using letters for unknown values
8
Line segment connecting two circle points
11
Repeated addition
12
Number with digits after a point