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132 = 2 (22/7) r
66 = (22/7) r
3 = r/7
r = 21
s^2 = r^2 + t^2
s = akar(21^2 + 20^2)
s = akar(841)
s = 29
A. Luas selimut : pi r s
Lsel = (22/7) * 21 * 29
Lsel = (22/7) * 21 * 29
Lsel = 1914
B. Luas Alas
pi r^2
(22/7) * 21^2
Luas Alas = 1386