Jawabanmu

2014-05-25T20:32:29+07:00
P = 15cm
l = 12 cm
t = 10 cm

Lp = 2 (p.l+p.t+l.t)
= 2(15.12 + 15.10 + 12.10)
= 2 (180 + 150 + 120)
= 2 (450)
= 900 cm2
2014-05-25T20:38:02+07:00
Luas permukaan = 2. (p.l + p.t + l.t)
= 2. (15 cm x 12 cm + 15cm x10cm + 12 cm x 10 cm)
= 2. (180cm + 150cm + 120cm)
= 2. (450cm)
= 900  cm^{2}
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