Jawabanmu

2014-01-29T09:02:14+07:00
L juring=(sudut/360) . L lingkaran
3,14=(100/360) . (1/4) .  \pi d ^{2}
3,14=10/36 .1/4 . 3,14 .  d^{2}
 \frac{36 . 4}{10 . 1} = d^{2}
d= \sqrt{14,4}
d=3,79