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= 2(10.8+10.6+6.8)
= 2(80+60+48)
= 2 x 188
= 376
L= 2(12.10+12.5+10.5)
= 2 (120+60+50)
= 2 x 230
= 460
=2(10×8+10×6+8×6)
=2(80+60+48)
=2×188
=376
2)Rumus=2(pl+pt+lt)
= 2(12×10+12×5+10×5)
= 2(120+60+50)
=2(230)
=460