1. luas permukaan balok yang panjangnya 2dm, lebar 30 mm, tinggi 5cm adalah... a.350mm2 b.350cm2 c.350dm2 d.175cm2
2.volume balok yang panjangnya 12,5cm, lebar 10,3cm, dan tinggi 3,2dm adalah a.4120cm3 b.412,0cm3 c.4120dm3 d.41,20dm3
liwonsubagyo
1) L.permukaan balok = 2( pxl + px t + l x t ) ....... = 2 ( 20 x 3 + 20 x 5 + 3 x 5 ) ... = 2( 60 + 100 + 15 ) ...... = 2 x 175 ..... = 350cm²...!!(c) 2). V balok = p x l x t .... = 12,5 x 10,3 x 3,2 ..... = 412 cm³ ......(b)
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Marcell99
1. p= 2 dm = 20 cm l = 30 mm = 3 cm t = 5 cm
p= 2 dm = 20 cm
l = 30 mm = 3 cm
t = 5 cm
Lp= 2.pl + 2.pt + 2lt
Lp = 2 . 60 + 2.100 + 2.15
Lp = 120 + 200 +30
Lp = 350 cm²
2.
p = 12,5 cm = 1,25 dm
l = 10,3 cm = 1,03 dm
t = 3,2 dm
v = plt
v = 1,25dm x 1,03dm x 3,2dm
v = 4,12 dm³ / 4120 cm³ (a)