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= 12 + 50 + 40 + 30
= 132 cm2
=1/2×4×3
=6cm
Lsisi tegak=keliling×tinggi
=(3+4+5)×10
=120cm
Lpermukaan prisma = 2×Lalas+siis tegak
=2×6+120
=12+120
=132cm²