Tolong dijawab pakai caranya yaa :)

kll = π d
22 = 3,14 x d
d = 22 : 3,14 = 7

L = π r²
= 22/7 x 3,5 x 3,5 = 38,5cm²

Pertama kita cari r terlebih dahulu
K = 2πr
22 = 2*22/7*r
r = 22*7/22*2
r = 154/44
r = 3,5 cm

Kemudian kita hitung luas lingkaran
L = πr²
L = 22/7*3,5²
L = 22/7*12,25
L = 269,5/7
L = 38,5 cm²   (B)