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= 1/2 alas x tinggi + 1/2 jumlah sisi sejaajr x tinggi
= 1/2 x 8 x 7 + 1/2 x(8+14)x 4
= 4 x 7 + 1/2 x 22 x 4
=28 + 11 x 4
= 28 + 44
= 1232 cm²