Across
1
Part of a line with two endpoints
5
Line crossing from corner to corner
6
Rectangular array of numbers
7
Total distance around a shape
8
Divisible by two
9
Number less than zero
11
Comparison of two quantities
14
Distance from center to edge of circle
Down
1
Result of addition
2
Symbol representing unknown value
3
Math using letters for unknown values
4
Three-sided polygon
10
Power to which a number is raised
12
Proven mathematical statement
13
Part of a circle's circumference