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144 + X^2=169
x^2=25
x=5,sama dengan lebar
lp=2.(pl+pt+lt)
lp=2.(96+60+40)
lp=2.196
lp=392cm
l = √13 kuadrat - 12 kuadrat
= √169 - 144
= √25
= 5 cm
L.P = (2 x luas alas) + (keliling alas x t)
= ( 2 x p x l) + ( 2 x (p+l) x t)
= (2 x 12 x 5) + ( 2 x (12+5) x 8)
= 120 + 272
= 392