Keliling lingkaran 66dm.Luas lingkaran tersebut adalah.....(22/7)

66dm =keliling
66 = 22/7 kali R kali 2
22/7 × 2R = 66
2R = 66 × 7/22
2R = 21
R = 21/2

21/2 × 21/2 × 22/7 = 346.5 dm^2 = 34650cm^2