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4x . 5x : 2 = 160
20 x² = 160 . 2
x² = 720 : 20
x = √36
x = 6
160 = 1/2 × 4a × 5a
160 = 10a
a = 160 : 10 = 16
a = 4
jadi:
alas = 4 × 4 = 16 cm
tinggi = 5×4 = 20 cm
semoga membantu. agar lebih jelas silahkan masukkan ke rumus.