From a solid cylinder of height 20cm and diameter 12cm a conical cavity of height 8cm and radius 6cm is hollowed out Find the total surface area of remaining solid
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46
height of cylinder = 20cm
diameter = 12
r= d/2
r= 12/2
r=6
height of cone = 8
r = 6
l = ✓6^2+8^2
l = ✓36+64
=
l = ✓100
l = 10
total surface area of solid= 2πrh+πrl
πr(2*h+l)
22/7*6(2*20+10)
22/7*6*50
6600/7
answer = 942.85 cm^2
diameter = 12
r= d/2
r= 12/2
r=6
height of cone = 8
r = 6
l = ✓6^2+8^2
l = ✓36+64
=
l = ✓100
l = 10
total surface area of solid= 2πrh+πrl
πr(2*h+l)
22/7*6(2*20+10)
22/7*6*50
6600/7
answer = 942.85 cm^2
Abhinav245:
hello i have a doubt why did you not add area of circle
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8
Answer:hope this helps u
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