Across
1
Single numeral from 0 to 9
3
Result of raising a number to an exponent
5
Line touching circle at one point
7
Rectangle with four equal sides
8
Distance from center to edge of circle
9
Middle value in an ordered dataset
10
System of ordered marks for measuring
12
Exact correspondence on both sides
Down
2
Math using letters for unknown values
4
Proven mathematical statement
6
Round shape with all points equidistant
11
Longest side of a right triangle
13
Number greater than zero