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Rigid Pentagonal Prism

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How many lines would you need to add to a pentagonal prism anchored to the ground to make it rigid?

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Solution Summary

The number of lines needed to be added to a pentagonal prism anchored to the ground to make it rigid are calculated. The solution is detailed and well presented.

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You need 2 lines to add to the prism to make it rigid. These lines are the solid red and blue ...

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