Answer
A triangle is the most stable shape; it can't collapse without breaking a side or detaching a corner. It has no incentive to collapse to a tighter shape.
Work Step by Step
This is discussed on page 233.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 12 - Think and Discuss - Page 243: 84
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