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= (12+8) x 5 :2
= 20 x 5 :2
= 100 : 2
= 50 cm2
a =12
b = 8
t = 5
Luas = (a + b) x t /2
= (12 + 8) x 5 /2
= 20 x 5 /2
= 100 /2
= 50 cm²