Pake cara ya, makasih..
besar loh poinnya... nomor 35 saja kok
besar loh poinnya... nomor 35 saja kok
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35.
T tabung = 8 , T Kerucut = 12 , r = 10/2 = 5
LP = L alas + L selimut tabung + L.Selimut Kerucut
= πr²+2πrt+πrs
= πr(r+2t+s)
=π.5(5+2.8+s)
= 5π(21+s)
Untuk mencari s bisa pakai rumus pitagoras :
s = √(12²+5²)
s = 13
LP = 5π(21+13)
LP = 5π(34)
= 5π(30+4)
= π(150+20)
= 170π
LP = 533,8 cm²