maka luasnya adalah?

K = π × d
132 = 22/7 × d
132 × 7 = 22 × d
924 = 22 d
d = 924 ÷ 22
d = 42 cm
r = 21 cm

L = π × r²
= 22/7 × 21 × 21
= 1386 cm² (C)