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t=5
l=?
Lalas=122
luas permukaan?
Lalas=122
p.l=122
14.l=122
l=122/14
=8,72
Lpermukaan=2(pl+pt+lt)
=2(14×8,72+14×5+8,72×5)
=2×(122+70+43,58)
=2×235,58
=471,16