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4:3
alas=12
tinggi=???
luas=???
alas
4x=12
x=12/4
x=3
tinggi
3x=3(3)=9
luas
L=a x t
=12 x 9
=108 cm²
a = 4x = 12
= x. = 12:4
= x. = 3
t = 3x
= 3.3
= 9
L = 9 x 12
= 108 cm