Across
1
Sum divided by count
2
Single numeral from 0 to 9
5
Exact correspondence on both sides
6
Result of raising a number to an exponent
7
U-shaped curve of a quadratic function
Down
2
Line crossing from corner to corner
3
Divisible by two
4
Number greater than zero
8
Rectangle with four equal sides
9
Line segment connecting two circle points
10
Value that does not change
11
Part of a line with two endpoints
12
Three-sided polygon