Take two regular tetrahedrons and stick them along a common base. The number of

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Take two regular tetrahedrons and stick them along a common base. The number of edges in the new three-dimensional shape formed is? (Enter number in digits)
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Answer:
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A tetrahedron has 6 edges. Two tetrahedrons will have 12 edges. After sticking them, 3 edges will be common. So, number of edges = 12 - 3 = 9

Take Two Regular Tetrahedrons And Stick Them Along A Common ...

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