Across
1
Closed shape with straight sides
3
Distance from center to edge of circle
5
Lines that never intersect
6
Result of addition
8
Rectangular array of numbers
9
Parts per hundred
12
Number with digits after a point
13
Part of a line with two endpoints
Down
2
Mathematical rule or equation
4
Mathematical statement of equality
7
Proven mathematical statement
10
Number less than zero
11
Corner point of a polygon