Across
1
Part of a line with two endpoints
2
Distance from center to edge of circle
3
U-shaped curve of a quadratic function
5
Mathematical rule or equation
7
Difference between highest and lowest values
Down
1
Exact correspondence on both sides
3
Parts per hundred
4
Space between two intersecting lines
6
Rectangular array of numbers
8
Number divisible only by 1 and itself
9
Three-sided polygon