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Verified answer
∠ACB = 180° -125° = 55°AC = BC berarti ∠CAB = ∠ABC, karena merupakan segitiga sama kaki
∠CAB = ∠ABC = x°
∠ACB + ∠ABC + ∠CAB = 180°
55° + x° + x° = 180°
2x° = 180° - 55°
2x° = 125°
x = 125 ÷ 2
x = 62,5°
x + y = 180°
62,5° + y = 180°
y = 180° - 62,5°
y = 117,5°
Verified answer
Mapel : MatematikaKelas : VII SMP
Bab : Sudut
Pembahasan :
Karena AC = BC, maka sudut < A = < B
Teorema Sudut Luar
< A + < B = 125°
x + x = 125
2x = 125
x = 62,5°
Sudut berpelurus
x + y = 180°
62,5 + y = 180
y = 180 - 62,5
y = 117,5°