Question: 20. OABCD is a pyramid in which the horizontal base ABCD is a square of sides 8cm. If OA-OB-OC-OD-12cm. Find to four significant figures

20. OABCD is a pyramid in which the horizontal base ABCD is a square of sides 8cm. If OA-OB-OC-OD-12cm. Find to four significant figures where applicable; (a) The vertical height of the pyramid (b) The angle between planes OAB and ABCD (c) The angle between planes OBC and OAD (d) The angle between planes OAB and OBC

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