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19 = 4y x 3y
19 = 12y²
y² = 19/12 = 1,583
y = 1,25
alas = 4 x 1,25 = 5 cm
tinggi = 3 x 1,25 = 3,75 cm
19 = 4y x 3y
19 = 12y²
y²= 1,583
y= 1,25
jadi alas = 4y = 4(1,25) = 5cm
tinggi = 3y = 3(1.25) = 3,75 cm