r = 21 cm
tt = 21 cm
tk = 28 cm
s^2 = r^2 + tk^2
s^2 = 21^2 + 28^2
s^2 = 441 + 784
s^2 = 1225
s = V1225
s = 35 cm
Lp bangun
= Lsk + Lst + L 1/2 bola
= (phi × r × s) + (2 × phi × r × tt) + (1/2 × 4 × phi × r^2)
= (22/7 × 21 × 35) + (2 × 22/7 × 21 × 21) + (1/2 × 4 × 22/7 × 21 × 21)
= 2310 + 2772 + 2772
= 7854 cm^2
keterangan :
r = jari-jari
tt = tinggi tanung
tk = tinggi kerucut
s = sisi miring kerucut
Lsk = Luas selimut kerucut
Lst = Luas selimut tabung
L 1/2 bola = Luas setengah bola
V = akar
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r = 21 cm
tt = 21 cm
tk = 28 cm
s^2 = r^2 + tk^2
s^2 = 21^2 + 28^2
s^2 = 441 + 784
s^2 = 1225
s = V1225
s = 35 cm
Lp bangun
= Lsk + Lst + L 1/2 bola
= (phi × r × s) + (2 × phi × r × tt) + (1/2 × 4 × phi × r^2)
= (22/7 × 21 × 35) + (2 × 22/7 × 21 × 21) + (1/2 × 4 × 22/7 × 21 × 21)
= 2310 + 2772 + 2772
= 7854 cm^2
keterangan :
r = jari-jari
tt = tinggi tanung
tk = tinggi kerucut
s = sisi miring kerucut
Lsk = Luas selimut kerucut
Lst = Luas selimut tabung
L 1/2 bola = Luas setengah bola
V = akar