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<D=70°.....2x+5°
<B=55°
jlh seluruh sudut segitiga 180°
jadi Y pada<C=(55°-10°)÷2
y=45°÷2
y=22,5°
jadi X pada<D=(70°-5°)÷2
x=65°÷2
x=33,5°
x+y=22,5°+33,5°
x+y=55°
sehingga sepertinya jawabannya D
∠CDB = (2x + 5)°
maka
∠ABD = ∠BCD + ∠CDB
⇒ 125 = 2y + 10 + 2x + 5
⇒ 2x + 2y + 15 = 125
⇒ 2x + 2y = 110
⇒ 2(x + y) = 110
⇒ x + y = 110/2
⇒ x + y = 55°
Jawab : D
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