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sudut a = 42
jmlh sdt segi 3 =180
a+b+c = 180
42+68+c=180
110+c=180
c= 180-110
c= 70
= 22/7 . 14 . 14
= 22 . 28
= 616 cm2
LJ = α/360 . LO
LJ = 135/360 . 616
= 3/8 . 616
= 231 cm2