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d2 = 8cm
tprisma = 1 cm
sisi b.k. = √3²+4²
= √9+16
= √25
= 5cm
Lpermukaan = (2La)+(Ka.tprisma)
= (2.1/2.d1.d2)+(4s+tprisma)
=(2.1/2.6.8)+(4.5.1)
=48+20
=68cm