Across
1
Power to which a number is raised
4
Symbol representing unknown value
6
Math using letters for unknown values
7
System of ordered marks for measuring
9
Number with digits after a point
10
Round shape with all points equidistant
Down
2
Rectangular array of numbers
3
Sum divided by count
4
Corner point of a polygon
5
U-shaped curve of a quadratic function
8
Longest side of a right triangle