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In the figure below AG=GH=EJ=ED=4 cm. AH=BH=CJ=DJ and AB=CD.
Calculate:
(a) CJ and DC.
(b) the ratio of the area of AGH to ABH.
(c) the ratio of the volume of AHJDEG to ABCDJH.
(d) the volume and the surface area of the whole block if GE = BC = 2DJ.