Across
1
Total distance around a shape
5
Longest side of a right triangle
6
Power to which a number is raised
7
Symbol representing unknown value
9
Sum divided by count
10
Value that does not change
12
Amount of space an object occupies
14
Rectangular array of numbers
Down
1
Parts per hundred
2
Three-sided polygon
3
The number representing nothing
4
Mathematical rule or equation
8
Split into equal parts
11
Reference line in a graph
13
Part of a whole number