A solid cylinder has total surface area of 1386sq cm . its curved surface area is on ninth of its total surface area . find the radius and height of the cylinder
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CSA=2(pi)rh
TSA=2(pi)r(h+r)
butgiven,
csa=1/9(tsa)
=1/9(1386)
=154 sq.cm
also,
tsa=CSA+2(pi)r^2
1386=154+2*22/7*r^2
1232=44/7*r^2
r^2=196
r=14...
csa=2(pi)rh=154
2*22/7*14*h=154
h=7/4...
therefore,
radius=14 cm and
height=7/4cm=1.75 cm...
I hope it's correct....!!
TSA=2(pi)r(h+r)
butgiven,
csa=1/9(tsa)
=1/9(1386)
=154 sq.cm
also,
tsa=CSA+2(pi)r^2
1386=154+2*22/7*r^2
1232=44/7*r^2
r^2=196
r=14...
csa=2(pi)rh=154
2*22/7*14*h=154
h=7/4...
therefore,
radius=14 cm and
height=7/4cm=1.75 cm...
I hope it's correct....!!
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