Across
1
Value that does not change
4
Three-sided polygon
5
Exact correspondence on both sides
8
Space between two intersecting lines
Down
2
Power to which a number is raised
3
Corner point of a polygon
4
Line touching circle at one point
5
Rectangle with four equal sides
6
Repeated addition
7
Symbol representing unknown value
9
Rectangular array of numbers
10
Parts per hundred