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carany
luas selimut kerucut1 : luas selimut kerucut2
phi.r.s : phi.r.s
phi.r ny di coret karena memiliki bilangan yg sama jadi hanya tersisa yg S ny saja
s:s maka 5:4
πrs : πrs
coret π dan r nya ( karena samaya )
s : s
5 : 4