横向
1
Space between two intersecting lines
4
Part of a circle's circumference
5
Number less than zero
6
Repeated addition
8
U-shaped curve of a quadratic function
11
Middle value in an ordered dataset
13
Result of multiplication
纵向
2
Line crossing from corner to corner
3
Power to which a number is raised
7
Collection of distinct elements
9
Round shape with all points equidistant
10
Longest side of a right triangle
12
Reference line in a graph