Problem analysis: according to the characteristics of cylinder, cone and ball: the two bottom surfaces of cylinder are round, the bottom surface of cone is round, and the ball is round no matter which side it looks from; This can be answered. This question examines the characteristics of cylinder, cone and ball, and it is the key to solve this question to understand the characteristics of cylinder, cone and ball.

Extended data:

Observing objects from different directions, it needs to be clear that in general, the shapes seen by observing three-dimensional graphics from different directions are different; At the same time, we should master the characteristics of common three-dimensional graphics. This kind of topic exercises students' spatial imagination and abstract thinking ability.

Test site prompt

This question is about the understanding of graphics. To solve this problem, we must understand the characteristics and observation methods of three-dimensional graphics.

Problem-solving skills

According to the common sense of daily life, we can know that there are three-dimensional figures with round faces, such as cylinders and cones;

According to the requirements of the topic, try to complete the answer by yourself, and pay attention to the fact that the answer to this question is not unique.

Baidu encyclopedia-cylinder