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tarik diagonal sisi AC dan BD berpotongan di titik O
AC = s√2 -----> AO = OC = s√2
OG =
=
=
=
= .s√6
lihat Δ AOG
AG = s√3 (diagonal ruang)
sudut OAG adalah sudut antara garis AG dan bidang ABCD
OG² = AO² + AG² - 2.AO .AG .cos sudut OAG
= + - 2 . s√2 . s√3 .cos sudut OAG
s² = s³ + 3s² - s².√6 cos OAG
= + 3 - √6.cos OAG
√6.cos OAG = + 3 -
√6 .cos OAG = 2
cos OAG =
= √6
sin² OAG = 1 - cos² OAG
= 1 -
= 1 -
=
sin OAG =
=