Across
1
Single numeral from 0 to 9
3
Longest side of a right triangle
4
Collection of distinct elements
7
Result of raising a number to an exponent
9
Value that does not change
10
Line crossing from corner to corner
13
Reference line in a graph
Down
2
Power to which a number is raised
5
Rectangle with four equal sides
6
Three-sided polygon
8
Divisible by two
11
Closed shape with straight sides
12
Part of a whole number