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R=1/2xd=1/2x21cm=10,5
Phi=3,14
Tinggi tabung: 35cm
L=luas alas x tinggi
(3,14x10,5x10,5)x35cm
346,185cm^2x35cm
=12.116,475
Jadii luasnya 12.116,475 sorry kalo salahh yaa