Across
1
Split into equal parts
4
Parts per hundred
6
Symbol representing unknown value
13
Corner point of a polygon
Down
2
Steepness of a line
3
Round shape with all points equidistant
5
Number divisible only by 1 and itself
7
The number representing nothing
8
Rectangle with four equal sides
9
Total distance around a shape
10
Exact correspondence on both sides
11
Lines that never intersect
12
Sum divided by count
14
Comparison of two quantities