4 Legged Tripod A Tripod Is A 3 Legged Stand Used By A Photographers To Hold Their Cameras Steady.?

A tripod is a 3 legged stand used by a photographers to hold their cameras steady.? - 4 legged tripod

So the question is, why think tripods or offer more stability than the 4 feet? What are the 5 principles to justify your answer?

This is one of my math question geometry does not understand. Please helpp