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= 1/2 x 16+4 x 9
= 1/2 x 20 x 9
= 1/2 x 180
= 90 cm
L= 1/2 x alas x tinggi
= 1/2 x 4 x 9
= 1/2 x 36
= 18 cm
L = 90-18
= 72 cm
maaf kalo keliru