kelilingnya adalah...

L bangun = 3/4 phi r^2
462 cm^2 = 3/4 22/7 r^2
r^2 = (462 cm^2 x 28)/66
r = akar dari 196 cm^2
r = 14 cm

K = 3/4 K lingkaran + 2r
= 3/4. 2 phi r + 2. 14 cm
= 3/2. 22/7. 14 cm + 28 cm
= 66 cm +28 cm
= 94 cm (A)