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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. A cylindrical rod has an outer curved surface area of \(7500 \text{ cm}^2\). If the length of the rod is 92 cm, then the outer radius (in cm) of the rod, rounded off to two places of decimal, is:
    \(\left(\text{Take } \pi = \frac{22}{7}\right)\)
  2. A number of 512 identical small spheres are cast from a sphere of radius 40 cm, with the total volume of the small spheres being equal to the volume of the larger sphere. The diameter (in cm) of each of the small spheres is:
  3. There is a wooden block in the form of a cube whose each side is 8 meters long. 

    The maximum possible number of cylinders with a diameter of 1 meter and a height of 4 meters were cut from this block. The cylinders are to be painted at the rate of ₹14 per square meter.
     

    What is the total amount (in ₹) needed to paint all the cylinders if we paint the entire surface of each cylinder? (Take $\pi = \frac{22}{7}$)

  4. If the lateral surface area of a cylinder is $140.1 \text{ cm}^2$ and its height is $3 \text{ cm}$, then find its volume. (Use $\pi = 3.14$ and round off to two decimal places.)
  5. Six cubes each of side 4 cm, are placed adjacent to each other. Find the volume of the cuboid so formed.
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