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Verified answer
Kotak Id = 20V2 cm
kotak II
volume = 8.000 cm^3
kotak I
d = 20V2 cm
maka rusuknya :
d = rV2
20V2 = rV2
r = (20V2)/(V2)
r = 20 cm
Kotak II
V = 8.000 cm^3
V = r^3
8.000 = r^3
(20)^3 = r^3
r = 20 cm
Jadi kedua mainan yang dimiliki Doni kongruen karena memiliki panjang rusuk yang sama yaitu 20 cm