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*Lp=Luas permukaan
p=panjang
l=lebar=6
t=tinggi=3
maka:
198=2(6p+6x3+3p)
198=2(9p+18)
99=9p+18
81=9p
9=p
198 cm2 = 2(p x 6cm + p x 3cm +6 x 3)
198/2 = 6p+3p+18
99 = 9p+18
99-18=9p
81/9=p
9=p