A tall structure needs to have a big and stable base that can support the whole weight of the structure, and the weight become lighter and lighter as the higher they go.
2.What makes a tall structure stable?
First, the weight of the base must heavier than the weight of the top. Second, the base needs to be big and in a stable shape, for example triangle, it is the most stable shape, so it is not easily to broken down. Third, the structure has to be symmetry. Finally, the top of the structure has to be perpendicular to the ground. Center of gravity of the structure is the same place of the center point of the base.
3.What is the centre of gravity?
The center of mass is the point where the gravity is considered to be acting the most within the object
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