Across
1
Rectangular array of numbers
4
Line segment connecting two circle points
5
Longest side of a right triangle
6
Line touching circle at one point
8
Number divisible only by 1 and itself
9
Math using letters for unknown values
Down
2
Single numeral from 0 to 9
3
Distance from center to edge of circle
7
Parts per hundred
10
Closed shape with straight sides
11
Corner point of a polygon
12
Part of a circle's circumference