Across
1
The number representing nothing
4
Steepness of a line
5
Distance from center to edge of circle
8
Result of multiplication
9
Rectangular array of numbers
12
Math using letters for unknown values
Down
2
Result of raising a number to an exponent
3
Line segment connecting two circle points
6
Split into equal parts
7
Symbol representing unknown value
8
Number divisible only by 1 and itself
10
Longest side of a right triangle
11
Line touching circle at one point