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810=5x*3x*2x
810=30x^3
x^3=810/30
=27
x=akar 3 dari 27
x=3 cm
p=5*3=15cm
l=3*3=9cm
t=2*3=6cm
Lp=2(pl+pt+lt)
=2(135+90+54)
=2(279)
=558 cm^2