Across
1
Three-sided polygon
4
Part of a circle's circumference
5
System of ordered marks for measuring
7
Comparison of two quantities
8
Power to which a number is raised
10
Steepness of a line
Down
2
Round shape with all points equidistant
3
Sum divided by count
5
Exact correspondence on both sides
6
Mathematical statement of equality
9
Value that does not change