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luas = a x t / 2
90 = 4x . 5x / 2
180 = 20x²
x² = 9
x = 3
tinggi = 5x
= 5 x 3
= 15 cm
90 = 1/2 a X t
180 = a X t
a = 4/9 X 180
= 80 cm
t = 5/9 X 180
= 100 cm