Across
1
Line segment connecting two circle points
4
Lines that never intersect
5
Three-sided polygon
6
Middle value in an ordered dataset
8
Parts per hundred
10
Symbol representing unknown value
12
Single numeral from 0 to 9
Down
2
System of ordered marks for measuring
3
Split into equal parts
4
U-shaped curve of a quadratic function
7
Closed shape with straight sides
9
Math using letters for unknown values
11
Round shape with all points equidistant