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Question:

To prevent rolling, how many points of contact are required, at minimum, for a boulder resting on a rounded or partially rounded side?

A 3
explanation

Requirements If the flattest side of the boulder is rounded or partially rounded, place the boulder in a crib made of hardwood fixed to deck of vehicle. Boulder should rest on both deck and timber, with at least 3 well-separated points of contact that prevent rolling in any direction.

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