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2 x (8 + 12)
= 2 x 20
= 40
Luas:
d1 = 3 + 10
d1 = 13
d2 = 5 x 2
d2 = 10
L = (d1 x d2) : 2
= (13 x 10) : 2
= 130 : 2
= 65 cm2
Semoga membantu
(Maaf kalo salah, angkanya kurang jelas)