Across
1
Rectangular array of numbers
2
Result of addition
3
Proven mathematical statement
4
Parts per hundred
5
Number with digits after a point
7
Longest side of a right triangle
8
Round shape with all points equidistant
Down
1
Repeated addition
2
Collection of distinct elements
5
Single numeral from 0 to 9
6
Part of a circle's circumference
9
Amount of space an object occupies