Across
1
Part of a circle's circumference
3
U-shaped curve of a quadratic function
4
Single numeral from 0 to 9
5
Corner point of a polygon
8
Proven mathematical statement
9
Mathematical rule or equation
10
Rectangle with four equal sides
Down
2
Three-sided polygon
6
Part of a whole number
7
Part of a line with two endpoints
9
Number that divides evenly into another
11
Reference line in a graph