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20 x 20 = 400
maka 1/4 x 400 =100
maka rusuk = akar dari 100 yaitu 10 cm
volume = 10 x 10 x 10 =1000 cm kubik
Volume awal = 400xt = 400t
Panjang rusuk baru = 1/4 x 20 = 5 cm
Luas alas baru = s² = 5² = 25 cm²
volume baru = 25xt = 25t cm³
Perubahan volume : volume baru : volume awal = 25t / 400t = 1/16 x atau mengecil 16x