Across
1
Amount of space an object occupies
4
Closed shape with straight sides
5
Part of a circle's circumference
9
Line crossing from corner to corner
10
Parts per hundred
12
Reference line in a graph
15
Proven mathematical statement
Down
2
Middle value in an ordered dataset
3
Steepness of a line
6
System of ordered marks for measuring
7
Visual representation of data
8
Repeated addition
11
Math using letters for unknown values
13
Rectangle with four equal sides
14
Rectangular array of numbers