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Question

The height of a cylinder is 14cm and its curved surface area is 264cm². The volume of the cyclinder (in cm³) is:
($\pi=\frac{22}{7}$)

The correct answer is
1584

Cylinder Volume Calculation

This solution explains how to find the volume of a cylinder when its height and curved surface area are known.

Given Information

  • Height of the cylinder, $h = 14$ cm.
  • Curved Surface Area (CSA) of the cylinder = $264$ cm².
  • The value of pi ($\pi$) is given as $\frac{22}{7}$.

Finding the Radius of the Cylinder

The formula for the curved surface area (CSA) of a cylinder is:

$ \text{CSA} = 2 \pi r h $

Where '$r$' is the radius and '$h$' is the height.

We are given CSA = $264$ cm² and $h = 14$ cm. We can substitute these values into the formula to find the radius '$r$':

$ 264 = 2 \times \frac{22}{7} \times r \times 14 $

Simplify the equation:

$ 264 = 2 \times 22 \times r \times \frac{14}{7} $

$ 264 = 2 \times 22 \times r \times 2 $

$ 264 = 88 \times r $

Now, solve for '$r$':

$ r = \frac{264}{88} $

$ r = 3 $

So, the radius of the cylinder is $3$ cm.

Calculating the Volume of the Cylinder

The formula for the volume ($V$) of a cylinder is:

$ V = \pi r^2 h $

Now substitute the values of $\pi$, the calculated radius ($r=3$ cm), and the given height ($h=14$ cm) into the volume formula:

$ V = \frac{22}{7} \times (3 \text{ cm})^2 \times 14 \text{ cm} $

$ V = \frac{22}{7} \times 9 \text{ cm}^2 \times 14 \text{ cm} $

Simplify the calculation:

$ V = 22 \times 9 \times \frac{14}{7} \text{ cm}^3 $

$ V = 22 \times 9 \times 2 \text{ cm}^3 $

$ V = 22 \times 18 \text{ cm}^3 $

$ V = 396 \text{ cm}^3 $

Conclusion

Therefore, the volume of the cylinder is calculated to be $396$ cm³.

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Important Questions from Mensuration 3D (Notes)

  1. On a spherical balloon of 10 cm radius, a circular colour patch has an area of 25 cm². If the balloon is uniformly expanded to a sphere of 50 cm radius, the area of the colour patch in cm² would be
  2. A block of marble 5 m x 4 m x 2 m in size is cut into rectangular tiles of 1 m x 0.5 m size having thickness of 10 cm. Assuming 10% wastage in cutting, how many tiles will be made?
  3. What is the volume of a 6 m deep tank having rectangular shaped top 6m X 4 m and bottom 4 m X 2 m? (use mean-area method).
  4. The surface area of the solid generated by revolving the curve $x = e^t \cos t, y = e^t \sin t$ about y-axis $0 \leq t \leq \pi/2$ is
  5. The surface area of the plane $x + 2y + 2z = 12$ cut off by $x = 0, y = 0$ and $x^2 + y^2 = 16$ is
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