Across
1
Part of a line with two endpoints
5
Rectangular array of numbers
6
Collection of distinct elements
9
Repeated addition
10
Closed shape with straight sides
11
Round shape with all points equidistant
13
Corner point of a polygon
Down
2
Number less than zero
3
Divisible by two
4
Line touching circle at one point
7
Mathematical statement of equality
8
Number that divides evenly into another
12
System of ordered marks for measuring