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Pertanyaan

Perhatikan gambar di bawah ini! Jika CD garis bagi ∠ C dan ∠ ABC = 6 8 ∘ , besar ∠ BDC adalah....

Perhatikan gambar di bawah ini!

Jika CD garis bagi  dan  , besar  adalah....

  1. 77degree

  2. 103degree

  3. 110degree

  4. 154degree

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P. Tessalonika

Master Teacher

Mahasiswa/Alumni Universitas Negeri Medan

Jawaban terverifikasi

Pembahasan

Ingat garis bagi membagi sudut menjadi 2 bagian sama besar. Maka besar :

begin mathsize 14px style angle BAC plus angle ABC plus angle ACB equals 180 degree space space space space space space space space space space 42 degree plus 68 degree plus angle ACB equals 180 degree space  angle BAC space plus space angle ABC space plus space angle ACB equals 180 degree space space space space space space space space space 42 degree space plus space 68 degree space plus space angle ACB equals 180 degree space space space space space space space space space space space space space space space space space space space space 110 degree plus angle ACB space equals 180 degree space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space angle ACB equals 180 degree minus 110 degree space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space angle ACB equals 70 degree space  end style

Ingat garis bagi membagi sudut menjadi 2 bagian sama besar.

begin mathsize 14px style angle BCD equals 1 half cross times angle ACB angle BCD equals 1 half cross times 70 degree angle BCD equals 35 degree end style

begin mathsize 14px style angle ABC equals angle DBC equals 68 degree end style

Maka besar begin mathsize 14px style angle BDC end style:

begin mathsize 14px style angle BDC plus angle DBC plus angle BCD equals 180 degree space space space space space space space space space angle BDC plus 68 degree plus 35 degree equals 180 degree space space space space space space space space space space space space space space space space space angle BDC plus 103 degree equals 180 degree space space space space space space space space space space space space space space space space space space space space space space space space space space space space space angle BDC equals 180 degree minus 103 degree space space space space space space space space space space space space space space space space space space space space space space space space space space space space angle BDC equals 77 degree end style

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Besar ∠ ABC dan ∠ CBD pada gambar di bawah ini adalah.... ( ∠ A = 5 0 ∘ dan ∠ C = 7 5 ∘ )

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