Across
1
Three-sided polygon
4
U-shaped curve of a quadratic function
5
Corner point of a polygon
7
Collection of distinct elements
8
Repeated addition
9
Part of a whole number
Down
2
Part of a circle's circumference
3
Line crossing from corner to corner
4
Number greater than zero
6
Sum divided by count
9
Number that divides evenly into another
10
Mathematical statement of equality