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mungkin sepertinya P adalah titk potong diagonal alas dan rusuk alas = rusuk tegak = 6cm
< (ADT, PCT) = <PTC = α
CP = 1/2 diagonal alas = 3√2
TC = 6
sin <PTC = CP/TC = 3√2 / (6) =1/2 √2 = sin 45°
α = 45