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= 6×45
= 270 cm²
L2 = ½×20×20
= ½×400
= 200 cm²
LT = 270+200
= 470 cm²
catatan : a.L1 ( luas 1 ) adalah luas trapesium
b.L2 ( luas 2 ) adalah luas segitiga siku siku
c.LT = Luas Total
(25+20).12
=340
bangunan II luasnya : (a.t)/2
: (20.20)/2
=200
jadi 340+200 = 540