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∠BAC = ∠ABC
a) ∠BAC + ∠ABC + ∠ACB = 180°
∠BAC + ∠BAC + 100° = 180°
2∠BAC = 80°
∠BAC = 40°
b) ∠ABC = ∠BAC karena segitiga sama kaki, jadi ada dua sudut yang sama
∠ABC = 40°
c) ∠BCD = 180° - (∠DCE + ∠BCA)
∠BCD = 180° - (40° + 100°)
∠BCD = 40°
d) ∠DCE = ∠BAC karena berpelurus
∠DCE = 40°