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The figure below shows a square based pyramid VABCD. Point V is vertically above middle of the base ABCD. AB = 10cm and VC = 13cm
(a) The length of diagonal AC
(b) The height of the pyramid
(c) The acute angle between VB and the base ABCD
(d) The acute angle between BVA and ABCD
(e) The acute angle between AVB and DVC