: the two Numbers (any) assigned to two variables respectively, and the output

(1) the two variables as the length of the rectangular area

(2) the first variable as the radius of the area of a circle with circumference, the volume of a ball,

(3) with the first variable as the bottom radius, the second variable of cylinder and cone for high volume,

To write the output of the language is put forward, such as: the rectangular area of * *, rather than simply the output directly,