Across
1
Longest side of a right triangle
4
Part of a line with two endpoints
6
U-shaped curve of a quadratic function
7
Number that divides evenly into another
9
Part of a circle's circumference
10
Three-sided polygon
11
Round shape with all points equidistant
Down
2
Split into equal parts
3
System of ordered marks for measuring
5
Result of multiplication
8
Number divisible only by 1 and itself