luas lingkaran 2.464 cm.berapa jari jari dan kelilingnya??

L = πxrxr
2464 = 22/7 x  r2
2464 : 22/7 = r2
2464 x 7/22 = r2
784 = r2
akar 784 = r
28 = r

Keliling lingkaran = 2 πr = 2 x 22/7 x 28 = 176 cm

luas lingkaran = [tex] \pi [/tex] [tex] r^{2} [/tex]
2464= 22/7 [tex] r^{2} [/tex]
2464*7/22 = [tex]r^{2} [/tex]
784 = [tex]r^{2} [/tex]
r= [tex] \sqrt{784} [/tex]
r = 28

keliling lingkaran = 2 [tex] \pi [/tex] r
= 2* 88
=176