6cm
5cm
4cm
3cm
Correct answer is C
Base of pyramid of a square of side 8cm vertex directly above the centre edge = 4√3cm
From the diagram, the diagonal of one base is AC2 = 82 + 82
Ac2 = 64 + 64 = 128
AC = 8√2
but OC = 12AC = 8√22 = 4√2cm
OE = h = height
h2 = (4√3)2
16 x 2 - 16 x 2
48 - 32 = 16
h = √16
= 4
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