横向
1
Rectangle with four equal sides
3
Math using letters for unknown values
4
Line crossing from corner to corner
5
Corner point of a polygon
8
Longest side of a right triangle
纵向
1
Steepness of a line
2
Round shape with all points equidistant
6
Rectangular array of numbers
7
Middle value in an ordered dataset
9
Symbol representing unknown value
10
Result of addition
11
Number less than zero
12
Number divisible only by 1 and itself
13
Closed shape with straight sides
14
The number representing nothing