Across
1
Amount of space an object occupies
3
U-shaped curve of a quadratic function
4
Sum divided by count
5
Exact correspondence on both sides
7
Single numeral from 0 to 9
8
Line segment connecting two circle points
10
Number less than zero
12
Part of a circle's circumference
Down
2
Comparison of two quantities
3
Parts per hundred
6
Reference line in a graph
9
Distance from center to edge of circle
11
Corner point of a polygon
13
Rectangular array of numbers