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BCD = 114
BCA = 180 – 114 = 66

Segitiga = 180 derajat = BCA + BAC + ABC
180 – BCA = BAC + ABC
180 – 66 = X + (X + 4)
114 = 2X + 4
114 – 4 = 2X
110 = 2X
X = 110/2
X= 55

BAC = X = 55 (C)

Jawaban:

x⁰ = 55⁰

Penjelasan dengan langkah-langkah:

1.

<B = (x+4)⁰

<A = x⁰

<C = 180⁰-114⁰ = 66⁰

2.

<B + <A + <C = 180⁰

(x+4)⁰ + x⁰ + 66⁰ = 180⁰

2x⁰ + 70⁰ = 180⁰

2x⁰ = 110⁰

x⁰ = 55⁰