Luas selimut kerucut yang keliling alasnya 75,36, tinggi 16 cm dan pendekatan π =3, 14 adalah...
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5dregensleyer
Kliling alas = 75,36 2 x π x r = 75,36 2 x 3,14 x r = 75,36 6,28 x r = 75,36 r = 75,36/6,28 r = 12 cm s = √16²+12² = √256+144 =√400 = 20 cm
luas selimut Ls = π x r x s = 3,14 x 12 x 20 = 753,6 cm²
2 x π x r = 75,36
2 x 3,14 x r = 75,36
6,28 x r = 75,36
r = 75,36/6,28
r = 12 cm
s = √16²+12²
= √256+144
=√400
= 20 cm
luas selimut
Ls = π x r x s
= 3,14 x 12 x 20
= 753,6 cm²