Diketahui luas 1/2 lingkaran 962,5 cm2, berapa jari jarinya ??

L lingaran = 1/2 * 22/7 * r (pangkat 2)

962,5 cm2 = 22/7 * r (pangkat 2)

9625/10 *7/22 = r (pangkat 2)

306.25 (diakar 2) = r

17.5 = r

[tex] \frac{1}{2} [/tex] [tex] \pi [/tex] [tex] r^{2} [/tex] = 962,5
[tex] \pi r^{2} [/tex] = 962,5x2
[tex] \pi r^{2} [/tex] = 1925
[tex] r^{2} [/tex] = 1925 x [tex] \frac{7}{22} [/tex]
[tex] r^{2} [/tex] = 612,5
r= [tex] \sqrt{612,5} [/tex]
r= 24,75 cm