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kerucut

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by puteri amila nuraini on 20 August 2013

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Transcript of kerucut

pengertian
kerucut adalah bangun ruang sisi lengkung yang mempunyai 1 alas berbentuk lingkaran, dan 1 sisi berbentuk bidang lengkung
unsur-unsur kerucut
jaring jaring
Luas permukaan
Contoh soal luas permukaan
Diketahui:
s: 39cm r: 7cm
Ditanya : luas permukaan kerucut
Dijawab:
Lp: π.r ( r + s )
: 22/7. 7 ( 7 + 39 )
: 22 . 46
: 1.012 cm2
Volume
Rumus:
1/3 x l. alas x tinggi

Atau dengan kata lain:
1/3 . π . r . r . tinggi
Contoh Soal Volume
Diketahui:
Jari-jari 10 cm
Tinggi 15 cm
Berapakah volumenya?
kerucut
Contoh #2
Diketahui:
Diameter alas : 5 cm
s : 13cm
Berapakah luas permukaan?
JAWAB:
Lp : πr ( s + r )
: 3,14 . 5 ( 13 + 5 )
: 15,7 . 18
: 282,6 cm2
V= 1/3 . π . r . r . t
1/3 . (3,14x10x10 x 15)
= 1/3 x 4.710 = 1.570 cm3
jawab:
Contoh #2
Jari-jari kerucut 12cm dan tinggi 10cm, berapakah volumenya?
Jawab:
1/3 x (3,14 x 12x12 x 10) = 1.507,2 cm3

Thanks for listening! :)
Alas
Selimut
Garis lukis
Pusat
luas lingkaran + luas selimut
atau sama dengan
π.r + (s.t)
dimana
r : jari jari
s : sisi miring
t : tinggi
π.r.r + π.r.s
See the full transcript