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= 22/7 kali 6 kali 6
=113,1428.....................
a. 1/4*pi*D^2 = 1/4*22/7*(14^2) = 154
b. pi*D*t = 22/7*14*5 = 220
c. 1/4*pi*D^2-1/4*pi*d^2 = (1/4*22/7*(14^2)) - (1/4*22/7*(7^2)) = 154-38.5 = 115.5
2. Luas silinder atas =
a. pi*d*t = 22/7*7*5 = 110
b. 1/4*pi*d^2 = 1/4*22/7*(7^2) = 38.5
Total luas permukaan = 154+220+115.5+110+38.5 = 638 cm2
Jawabannya = C