Jawaban:
13 cm
Penjelasan dengan langkah-langkah:
L = 2 (pl + pt + lt)
202 = 2 (5l + 5(2) + 2l)
202/2 = 7l + 10
101 - 10 = 7l
91 = 7l
91/7 = l
13 = l
Keterangan :
Lp : Luas permukaan balok
p : panjang balok
l : lebar balok
t : tinggi balok
Penjumlahan variabel
a + a = (1 + 1) a = 2a
2a + 3a = (2 + 3) a = 5a
Perkalian variabel
a (b + c) = (a x b) + (a x c)
Pembahasan :
Kita misalkan lebar balok = a cm
Lp = 2 x [(p x l) + (p x t) + (l x t)]
202 cm² = 2 x [(5 cm x a cm) + (5 cm x 2 cm) + (a cm x 2 cm)
202 cm² = 2 x (5a cm^2 + 10 cm^2 + 2a cm^2)
202 cm^2 = 2 x ( 5a cm^2 + 2a cm^2 + 10 cm^2)
202 cm^2 = 2 x ( 7a cm^2 + 10 cm^2)
202 cm^2 = 14a cm^2 + 20 cm^2
14a cm^2 + 20 cm^2 = 202 cm^2
14a cm^2 = 202 cm^2 - 20 cm^2
14a cm^2 = 182 cm^2
a = (182 / 14) cm^2
a = 13 cm
Jadi, hasil perhitungan diatas adalah 13 cm
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Jawaban:
13 cm
Penjelasan dengan langkah-langkah:
L = 2 (pl + pt + lt)
202 = 2 (5l + 5(2) + 2l)
202/2 = 7l + 10
101 - 10 = 7l
91 = 7l
91/7 = l
13 = l
Jawaban:
Keterangan :
Lp : Luas permukaan balok
p : panjang balok
l : lebar balok
t : tinggi balok
Penjumlahan variabel
a + a = (1 + 1) a = 2a
2a + 3a = (2 + 3) a = 5a
Perkalian variabel
a (b + c) = (a x b) + (a x c)
Pembahasan :
Kita misalkan lebar balok = a cm
Lp = 2 x [(p x l) + (p x t) + (l x t)]
202 cm² = 2 x [(5 cm x a cm) + (5 cm x 2 cm) + (a cm x 2 cm)
202 cm² = 2 x (5a cm^2 + 10 cm^2 + 2a cm^2)
202 cm^2 = 2 x ( 5a cm^2 + 2a cm^2 + 10 cm^2)
202 cm^2 = 2 x ( 7a cm^2 + 10 cm^2)
202 cm^2 = 14a cm^2 + 20 cm^2
14a cm^2 + 20 cm^2 = 202 cm^2
14a cm^2 = 202 cm^2 - 20 cm^2
14a cm^2 = 182 cm^2
a = (182 / 14) cm^2
a = 13 cm
Jadi, hasil perhitungan diatas adalah 13 cm