Two students each made a small flag out of cardboard. Unit: cm (1) _ _ _ _ _ Small flag made of various materials. (2) Imagine: Lele's little flag.

(1) Lele Banner area: 20×8= 160 (square centimeter),

Taotao Banner area: 20× 15÷2= 150 (square centimeter),

160> 150,

So the flag made by Lele uses a lot of materials.

(2) Lele's flag is a cylinder after rapid rotation; The flag of Tao Tao rotates rapidly and the figure is a cone;

(3)3. 14×202×8,

=3. 14×400×8,

=3 14×32,

= 10048 (cubic centimeter);

A: The graphic volume obtained by the rapid rotation of Lele Banner is 10048 cubic centimeters.

So the answer is: Lele; A cylinder, a cone.