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sisi bawah = 4
tinggi = 9
rumus luas
(a+b)/2 x t
maka
(3+4)/2 x 9
7/2 x 9
3,5 x 9
31,5
2
= (atas+bawah)
2
=(3+4)x9
2
= 63
2
=31,5 cm²