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l. 3 segitiga 3.1/2.5.12 = 3.30 = 90
=> alas segitiga tadi dapetnya dari 13 kuadrat kurangi 5 kuadrat jadi nya 12
luas bangun= 400+90 = 490
maaf kalo salah
Luas Total=( Luas I - Luas III)+(Luas II-LuasIII)
=(400-30)+(120-30)
=370+90
=460 cm2