Berdasarkan gambar diatas, tentukan: a. ∠AOC

Berdasarkan gambar diatas, tentukan: a. ∠AOC

Berdasarkan gambar diatas, tentukan: a. ∠AOC

Jawaban yang benar adalah 135°

Konsep:
• Jumlah dua sudut yang berpelurus adalah 180°
• ∠ABC = ∠B

Pembahasan,

Diketahui:
sudut AOC = (5a + 60)° dan sudut BOC = 3a°

Ditanya,
sudut AOC = …

Karena sudut AOC dan sudut BOC berpelurus, maka:
∠ AOC + ∠BOC = 180°
(5a + 60)° + 3a° = 180°
(5a + 60 + 3a)° = 180°
8a + 60 = 180
8a = 180 – 60
8a = 120
a = 120/8
a = 15

Jadi,
∠ AOC = (5a + 60)°
= (5.15 + 60)°
= (75 + 60)°
= 135°

Sehingga, ∠AOC = 135°

Rekomendasi lainnya :

Baca Juga :  Every mornIng I 1.____ at five o'clock. First. I go to the 2.____. I 3.____ my teeth and take a bath. After that, I get 4.____ and comb my hair. Then I go to the 5.____. I eat sandwich and a glass of milk for breakfast. Then, I go to 6.____ by my 7.____. I 8.____ at school and then I study. I go 9.____ at one o'clock. I have 10.____ and play with my friends. In The evening, I 11.____ dinner with my family and then we 12.____ watching TV. I do my 13.____. I go to 14.____ at half past nine.
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