横向
1
Sum divided by count
3
Repeated addition
8
Part of a circle's circumference
9
Line crossing from corner to corner
纵向
2
Three-sided polygon
4
Space between two intersecting lines
5
Distance from center to edge of circle
6
Math using letters for unknown values
7
Longest side of a right triangle
10
Amount of space an object occupies
11
Symbol representing unknown value