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3,14 x 100 + 3,14 x 10 x 15
314 + 471
= 785 :)
pjg garis pelukis (s) = 15 cm
dit : luas seluruh kerucut?
jb:
La = πr²= 3,14 x (10)²= 314
Lselimut = πrs = 3,14 x 10 x 15 = 471
maka Luas seluruh adalah = La + Lselimut = 314 + 471 = 785 cm²