Jawaban:

A. ukuran panjang, lebar, dan tinggi balok.

L.sisi = 2 × (pl + pt + lt)

1.300 = 2 × (4x(2x) + 4x(3x) + 2x(3x)

1.300 = 2 × (8x + 12x + 6x)²

1.300 = 2 × (26x)²

1.300 = 52x²

x² = 1.300/52

x² = 25

x = √25

= 5

Panjang = 4x = 4 × (5) = 20 cm

Lebar = 2x = 2 × (5) = 10 cm

Tinggi = 3x = 3 × (5) = 15 cm

B. panjang kerangka balok.

r = 4p + 4l + 4t

r = 4 × (20) + 4 × (10) + 4 × (15)

r = 80 + 40 + 60

r = 180 cm

C. volume balok.

Volume

= p x l x t

= 20 x 10 x 15

= 3.000 cm³

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