Across
1
The number representing nothing
3
Result of addition
4
Three-sided polygon
7
Longest side of a right triangle
9
Rectangular array of numbers
12
System of ordered marks for measuring
Down
2
Part of a line with two endpoints
5
Distance from center to edge of circle
6
Mathematical statement of equality
8
Power to which a number is raised
10
Result of raising a number to an exponent
11
Number less than zero
13
Mathematical rule or equation