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6.,ABCD,AC=6,BD=8ACBDABCD,A1B1C1D1;A1B1C1D1,A2B2C2D2AnBnCnDn .2A1B1C1D1A2B2C2D2

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6.,ABCD,AC=6,BD=8ACBDABCD,A1B1C1D1;A1B1C1D1,A2B2C2D2AnBnCnDn .(3)A5B5C5D5.

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