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21. Which are prisms among the following?

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22. How are prisms and cylinders alike?

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23. How are pyramids and cones alike?

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24. Is a square prism same as a cube? Explain.

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25. Verify Euler’s formula for these solids.

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26. Using Euler’s formula find the unknown.

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27. Can polyhedron have 10 faces, 20 edges and 15 vertices?

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28. According to the Euler’s formula, we have F + V – E = ___________.

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29. A cuboid has _______ faces, _______ edges and _______ vertices.

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30. A polyhedron has 30 edges and 12 vertices. How many faces does it have?

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