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Perhatikan gambar di bawah ini! Panjang busur CD = 120 cm, dan π = 7 22 maka panjang busur BC adalah ….

Perhatikan gambar di bawah ini!

Panjang busur CD = 120 cm, dan π = $\frac{22}{7}$ maka panjang busur BC adalah ….

100 cm
98 cm
64 cm
32 cm

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Maka panjang busur BC adalah 32 cm.

$begin mathsize 12px style angle space B A C space equals space 40 degree space angle C A D equals 150 degree space space fraction numerator p a n j a n g space b u s u r space B C over denominator p a n j a n g space b u s u r space C D end fraction equals fraction numerator 40 to the power of degree over 360 to the power of degree 2 pi r over denominator 150 to the power of degree over 360 to the power of degree 2 pi r end fraction space space space space space space space space space space space space space space space space space space space space space space space space space space fraction numerator B C over denominator 120 end fraction equals fraction numerator fraction numerator 40 to the power of degree over denominator up diagonal strike 360 to the power of degree end strike end fraction up diagonal strike 2 pi r end strike over denominator fraction numerator 150 to the power of degree over denominator up diagonal strike 360 to the power of degree end strike end fraction up diagonal strike 2 pi r end strike end fraction space space space space space space space space space space space space space space space space space space space space space space space space space space space space B C equals fraction numerator 40 degree over denominator 150 degree space end fraction 120 space space space space space space space space space space space space space space space space space space space space space space space space space space space space B C equals 32 space c m end style$

Maka panjang busur BC adalah 32 cm.