Across
1
Difference between highest and lowest values
3
Number divisible only by 1 and itself
4
Distance from center to edge of circle
7
Exact correspondence on both sides
8
Line crossing from corner to corner
Down
2
Value that does not change
3
Closed shape with straight sides
5
Steepness of a line
6
Number with digits after a point
9
Result of raising a number to an exponent