Tolong di jawab menggunakan cara hanya e dan f

E.
L = Lb – Lk
L = 22/7 x 28 x 28 – 22/7 x 14 x 14
L = 2.464 – 616
L = 1.848

f.
L = Lb – Lk
L = 1/2 x 22/7 x 28 x 28 – 1/2 x 22/7 x 14 x 14
L = 1.232 – 308
L = 924