Perhatikan gambar berikut. Panjang busur AB adalah .... ( pakai rumus π = 22/7)
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Panjang busur AB
[tex] \frac{ \alpha }{180°} \times \pi \times r \\ \\ \frac{150°}{180°} \times \frac{22}{7} \times 21 \: cm \\ \\ 55 \: cm[/tex]