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a+b = 86 cm
L = [(a+b) x t] / 2
= [ 86 x 17 ] / 2
= 1462 / 2
= 731 cm2
t = 17 cm
jumlah sisi sejajar = 86 cm
maka :
L = 1/2 x (jumlah sisi sejajar) x t
= 1/2 x 86 x 17
= 731 cm²
Semoga membantu :)