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Dr^2 = p^2 + l^2 + t^2
(15akar8)^2 = (6x)^2 + (8x)^2 + (10x)^2
1800 = 36x^2 + 64x^2 + 100x^2
1800 = 200x^2
x^2 = 9
x = 3
panjang = 10 (3) = 30 cm
lebar = 8 (3) = 24 cm
tinggi = 6 (3) = 18 cm
p : l : t = 6 : 8 : 10
p = 6x
l = 8x
t = 10x
p² + l² + t² = (diagonal ruang)²
(6x)² + (8x)² + (10x)² = (15√8)²
36x² + 64x² + 100x² = 225√64
200x² = 225 × 8
200x² = 1800
x² = 9
√x² = √9
x = 3
p = 6x
= 6(3)
= 18 cm
l = 8x
= 8(3)
= 24 cm
t = 10x
= 10(3)
= 30 cm
Rusuk = 4(p + l + t)
= 4(18 cm + 24 cm + 30 cm)
= 4(72)
= 288 cm
Jadi jumlah panjang seluruh rusuk pada balok adalah 288 cm.