Hitunglah luas permukaan balok jika diketahui: - v: 24 cm kubik, p: 4cm, l: 3cm -v : 315 cm kubik, p: 9 cm, l: 7 cm
Handii
A. V = plt 24 = 4 x 3 x t t = 24/12 t = 2cm Luas Perm. = 2 (pt + pl + lt) L.P = 2 (8 + 12 + 6) Lp = 2 x 26 Lp = 52cm²
B. V = plt 315 = 9 x 7 x t t = 315/63 t = 5cm Luas Perm = 2 (pt + pl + lt) Lp = 2 (45 + 63 + 35) Lp = 2 x 143 Lp = 286cm²
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gitasavitrih
A) v = plt 24 = 4 x 3 x t 24 = 12 x t t = 24 : 12 = 2 cm Lp = 2( pl + pt + lt) Lp = 2( 4 x 3 + 4 x 2 + 3 x 2) Lp = 2(12 + 8 + 6) Lp = 2 x 26 Lp = 52 cm²
b) v = plt 315 = 9 x 7 x t 315 = 63 x t t = 315 : 63 = 5 cm Lp = 2(pl + pt + lt) Lp = 2(9 x 7 + 9 x 5 + 7 x 5) Lp = 2(63 + 45 + 35) Lp = 2 x 143 = 286 cm²
24 = 4 x 3 x t
t = 24/12
t = 2cm
Luas Perm. = 2 (pt + pl + lt)
L.P = 2 (8 + 12 + 6)
Lp = 2 x 26
Lp = 52cm²
B. V = plt
315 = 9 x 7 x t
t = 315/63
t = 5cm
Luas Perm = 2 (pt + pl + lt)
Lp = 2 (45 + 63 + 35)
Lp = 2 x 143
Lp = 286cm²
24 = 4 x 3 x t
24 = 12 x t
t = 24 : 12 = 2 cm
Lp = 2( pl + pt + lt)
Lp = 2( 4 x 3 + 4 x 2 + 3 x 2)
Lp = 2(12 + 8 + 6)
Lp = 2 x 26
Lp = 52 cm²
b) v = plt
315 = 9 x 7 x t
315 = 63 x t
t = 315 : 63 = 5 cm
Lp = 2(pl + pt + lt)
Lp = 2(9 x 7 + 9 x 5 + 7 x 5)
Lp = 2(63 + 45 + 35)
Lp = 2 x 143 = 286 cm²