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Question: i need help on 399c i already did the a...

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I need help on #399c. I already did the a and b. I need help on #408.
408. Given rectangle ABCD, let P be the point outside ABCD that makes triangle CDP equilateral, and let Q be the point outsid

399. Show that all the interior diagonals of a cube with 8-inch edges (a) have equal length, (b) bisect each other, and (c) a
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