Pertanyaan

Besar sudut BOA = 6 0 ∘ , dan panjang jari-jari OB = 7 cm. Panjang busur BA adalah .... cm.

Besar sudut BOA = $6 0^{\circ}$ , dan panjang jari-jari OB = 7 cm. Panjang busur BA adalah .... cm.

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N. Mustikowati

Master Teacher

Mahasiswa/Alumni Universitas Negeri Jakarta

Jawaban terverifikasi

Pembahasan

$begin mathsize 12px style fraction numerator p a n j a n g space B A over denominator k e l i l i n g space l i n g k a r a n end fraction equals space fraction numerator begin display style s u d u t space B O A end style over denominator s u d u t space 1 space l i n g k a r a n end fraction fraction numerator p a n j a n g space B A over denominator 2 πr end fraction space equals space fraction numerator 60 degree over denominator 360 degree end fraction fraction numerator P a n j a n g space B A over denominator 2 space x space begin display style 22 over 7 end style x space 7 space end fraction equals space 1 over 6 fraction numerator begin display style P a n j a n g space B A end style over denominator begin display style 44 end style end fraction equals space 1 over 6 P a n j a n g space B A space equals space fraction numerator 1 space x space 44 over denominator 6 end fraction space space space space space space space space space space space space space space space space space space space space space space space space equals space 7 comma 3 space c m end style$