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b. luas : d1xd2/2
: d1= 15(kuadrat)-12(kuadrat)
=81, diakar= 9, jadi d1=18
d1xd2/2
18x14/2=216cm(persegi)
Caranya: 15 X 24 = 360 / 2 = 180
Maap kalo salah