Across
1
Three-sided polygon
4
Line segment connecting two circle points
6
Lines that never intersect
7
Single numeral from 0 to 9
9
System of ordered marks for measuring
Down
2
U-shaped curve of a quadratic function
3
Longest side of a right triangle
5
Round shape with all points equidistant
6
Result of multiplication
7
Split into equal parts
8
Sum divided by count