Across
1
Longest side of a right triangle
7
Rectangular array of numbers
8
System of ordered marks for measuring
10
Line touching circle at one point
12
Repeated addition
Down
2
Part of a line with two endpoints
3
Distance from center to edge of circle
4
Divisible by two
5
Closed shape with straight sides
6
Lines that never intersect
9
Proven mathematical statement
11
Number with digits after a point