cara mencari diameter lingkaran dengan luas 154 cm2 Tolong di jawab ya.. Terima kasih

d = rxr

luas lingkaran = πr²
154 = 22/7xrxr
154/22/7 = rxr
154/1 : 22/7 =rxr
154/1 x 7/22 = rxr
49 = rxr
49 = d

Luas lingkaran = 22/7 × r^2
154 cm^2 = 22/7 × r^2
1078 = 22 × r^2
r^2 = 1078/22
r^2 = 49
r = akar49
r = 7

D = r + r
D = 7 +7
D = 14