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B= 60 derajat
C=45 derajat
D= 360-(90+60+45) =360-195= 165 derajat
jadi.....
A= x 240 = 60
B= x 240 = 40
C= x 240 = 30
D= x 240 = 110
Bisa dijumlahkan sendiri hasilnya pasti 240..