Across
1
Difference between highest and lowest values
3
Value that does not change
5
Symbol representing unknown value
6
Proven mathematical statement
8
Result of raising a number to an exponent
11
Rectangular array of numbers
12
Distance from center to edge of circle
Down
2
System of ordered marks for measuring
4
Power to which a number is raised
7
Line crossing from corner to corner
9
The number representing nothing
10
Part of a circle's circumference