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karena kaki nya pasti sama kalau sama kaki
total seluruh sudut trapesium = 360°
sisa= 360°-100°=260°
2 sudut di atas juga pasti sma besar
260° ÷ 2 = 130°
2c = 130°
c=65°
4b-2=130°
4b=132°
b=33°