Across
1
Symbol representing unknown value
5
Parts per hundred
6
Round shape with all points equidistant
9
Amount of space an object occupies
12
Line touching circle at one point
Down
2
Split into equal parts
3
Mathematical statement of equality
4
Mathematical rule or equation
5
U-shaped curve of a quadratic function
7
Reference line in a graph
8
Total distance around a shape
10
Three-sided polygon
11
Divisible by two