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Program for SSC CGL

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Maths / Surface Area and Volume / Total Surface Area of Cylinder

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Total Surface Area of Cylinder

A Cylinder of radius r and height h. The total surface area or TSA includes area of circular top and base as well as the curved surface area or CSA.

Length of rectangle= Circumference of base = $large 2pi r$

Breadth of rectangle = h

TSA = Area of base + Area of top + CSA of cylinder

$large =pi r^2 + pi r^2 + 2pi r h$

$=2pi r^2 + 2pi r h$

$=2pi r(r +h)$

Illustration: A solid cylinder has total surface area of 462 $cm^2.$ Its curved surface area is one-third of its total surface area. Find the radius and height of the cylinder.

Solution: Given: Curved surface area $=frac {1}{3} times Total;Surface;Area$

$Rightarrow$ $2 pi rh = frac {1}{3} times (2 pi rh + 2 pi r^2)$

$2 pi rh = frac {1}{3} times(2pi r) (r+h)$

$h = frac {1}{3} times (r+h)$

$3h =r+h$

$3h -h=r$

$2h=r$

$r=2h$ ...................(i)

Now, given that total surface area = 462

$Rightarrow$ Curved surface area $=frac {1}{3} times 462$

$Rightarrow$ $2pi rh=154$

Using equation (i0, we have

$2pi (2h)h=154$

$4pi h^{2}=154$

$h^{2}=frac{154}{4pi }$

$h^{2}=frac{154}{4}times frac{7}{22}$

$h^{2}=frac{7}{4}times 7$

$h^{2}=frac{49}{4}$

$h=sqrt{frac{49}{4}}$

$h=pm frac{7}{2}$

As $hneq - frac{7}{2}$

So, $h = frac{7}{2}$

Hence height of cylinder = 3.5 cm

Using equation (i), we have

and radius of cylinder = r = 2h

$= 2times frac{7}{2}$

= 7 cm

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Total Surface Area of Cylinder

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