Across
1
Line crossing from corner to corner
4
Result of raising a number to an exponent
5
Part of a line with two endpoints
7
Three-sided polygon
10
U-shaped curve of a quadratic function
12
Proven mathematical statement
Down
2
Sum divided by count
3
Steepness of a line
5
System of ordered marks for measuring
6
Number with digits after a point
8
Middle value in an ordered dataset
9
Repeated addition
11
The number representing nothing