Across
1
Rectangular array of numbers
4
Line crossing from corner to corner
5
System of ordered marks for measuring
7
Line touching circle at one point
Down
2
U-shaped curve of a quadratic function
3
Single numeral from 0 to 9
5
Result of addition
6
Comparison of two quantities
8
Difference between highest and lowest values
9
Round shape with all points equidistant