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alas=18cm
L=1/2(a.t)
153=1/2.18.t
153.2=18.t
306=18.t
t=306/18
t=17 cm
luas 153 cm
dit= tinggi
jwb=luas =1/2 alas kali tingg
=alas X tinggi =153 X 2
=306
tinggi=306:18=17