Across
1
Longest side of a right triangle
5
Symbol representing unknown value
6
Math using letters for unknown values
7
Number that divides evenly into another
9
Three-sided polygon
12
Number greater than zero
13
Collection of distinct elements
14
Proven mathematical statement
Down
2
Part of a line with two endpoints
3
Corner point of a polygon
4
Closed shape with straight sides
8
Total distance around a shape
10
Middle value in an ordered dataset
11
Distance from center to edge of circle