Across
1
Longest side of a right triangle
3
Closed shape with straight sides
5
Rectangular array of numbers
6
Line crossing from corner to corner
7
Comparison of two quantities
Down
2
Steepness of a line
3
Result of raising a number to an exponent
4
Exact correspondence on both sides
6
Split into equal parts
8
Mathematical rule or equation
9
Total distance around a shape
10
The number representing nothing
11
Three-sided polygon