Across
1
Three-sided polygon
6
Exact correspondence on both sides
7
Divisible by two
8
Proven mathematical statement
9
Middle value in an ordered dataset
Down
2
Longest side of a right triangle
3
Single numeral from 0 to 9
4
Mathematical rule or equation
5
Parts per hundred
10
Part of a circle's circumference
11
Number with digits after a point