Jawabanmu

2014-05-19T22:44:55+07:00
Rusuk a = √144
rusuk a = 12 cm

tΔ² = 6² + 8²
tΔ² = 36 + 64
tΔ² = 100
tΔ  = √100 = 10 cm

LΔ = 4 × 1/2 × 10 × 12
LΔ = 2 × 10 × 12
LΔ = 20 × 12 = 240 cm²

Lp = 144 + 240 = 384 cm²


Maaf kalau ada kesalahan :)
1 3 1
2014-05-19T23:01:34+07:00
L=s^
144cm^=s^
akar 144=12
tsegi3=8^+1/2 x 12^=64+36=100
akar 100=10
Lsegi3 x 4
1/2.12.10 x 4
60 x 4=240 cm^
Lalas=144

Lpermukaan=240+144=384 cm^