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=2 * 22/7 *21 (21 + 40 )
=8052 cm²
Keliling lingkaran alas/tutup = 2πr
132= (2) (π) (r)
(132/2) = (π) (r)
66 = (22/7) (r)
r= 21
Luas Sellimut = K.t = (2πr) (t) Luas alas = (π.r.r)
= 132x 40 = (22/7) (21) (21)
= 5280 = 1386
Luas Perm = 2 x luas alas + luas selimut
= 2x 1386+ 5280 = 2772+ 5280 = 8052