Jawabanmu

2014-02-24T21:07:36+07:00
a.  L_{juring} =  \frac{60}{360}  \pi  r^{2}  \\ 924 =  \frac{60}{360} \frac{22}{7}   r^{2}  \\ 924 =  \frac{11}{21}   r^{2}  \\ r^{2}=924 \frac{21}{11}  \\ r^{2}=1764 \\ r=42 \\  \\  b.K_{lingkaran} = 2 \pi r \\ K_{lingkaran} = 2 \frac{22}{7} 42 \\  K_{lingkaran} = 264
mkasih ya mas atas bantuan nya
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