Across
1
Symbol representing unknown value
4
Parts per hundred
8
Steepness of a line
9
Longest side of a right triangle
11
Part of a whole number
Down
2
Result of raising a number to an exponent
3
Round shape with all points equidistant
5
Proven mathematical statement
6
Space between two intersecting lines
7
Three-sided polygon
10
Math using letters for unknown values