Across
1
Total distance around a shape
6
Rectangle with four equal sides
7
Number less than zero
8
Exact correspondence on both sides
11
Middle value in an ordered dataset
12
Corner point of a polygon
Down
2
Number with digits after a point
3
Longest side of a right triangle
4
Mathematical rule or equation
5
Number divisible only by 1 and itself
6
Part of a line with two endpoints
9
Closed shape with straight sides
10
Result of raising a number to an exponent