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2πr = 484
πr = 484 / 2
πr = 242
r = 242 / π
r = 242 / (22/7)
r = 242 * 7 / 22
r = 77 cm
luas = πr²
= π 77²
= π 5929
= 22/7 * 5929
= 22 * 847
= 18.634 satuan luas
484 = 2 x 22/7 x y
y = 484 : 2 :22/7
= 242 x 7/22 = 77
y= jari-jari , berarti jari-jarinya 77
L = ²
= 22/7 x 77 x 77
= 242 x 77 = 18.634
~jadiin jawaban terbaik please