横向
1
Number less than zero
5
Proven mathematical statement
7
Three-sided polygon
8
Longest side of a right triangle
9
Distance from center to edge of circle
10
Visual representation of data
12
Part of a circle's circumference
13
Rectangle with four equal sides
纵向
2
U-shaped curve of a quadratic function
3
Divisible by two
4
System of ordered marks for measuring
6
Amount of space an object occupies
11
Rectangular array of numbers
14
The number representing nothing
15
Sum divided by count