Across
1
Rectangular array of numbers
4
Steepness of a line
6
System of ordered marks for measuring
7
Difference between highest and lowest values
8
Power to which a number is raised
9
Line touching circle at one point
Down
2
Sum divided by count
3
Value that does not change
5
Round shape with all points equidistant
10
Result of addition
11
Comparison of two quantities
12
Corner point of a polygon
13
Lines that never intersect