Home
Class 10
MATHS
State True or False: A solid cylinder o...

State True or False:
A solid cylinder of radius r and height h is placed over other cylinder of same height and radius. The total surface area of the shape so formed is `4pi h + 4pi r^2`

Text Solution

AI Generated Solution

The correct Answer is:
To determine whether the statement is true or false, we need to calculate the total surface area of the combined shape formed by stacking two identical cylinders on top of each other. ### Step-by-Step Solution: 1. **Identify the dimensions of the cylinders**: - Each cylinder has a radius \( r \) and height \( h \). 2. **Determine the height of the combined shape**: - When one cylinder is placed on top of another, the total height becomes \( h + h = 2h \). 3. **Calculate the total surface area**: - The total surface area (TSA) of a cylinder is given by the formula: \[ \text{TSA} = 2\pi r h + 2\pi r^2 \] where \( 2\pi r h \) is the curved surface area and \( 2\pi r^2 \) accounts for the area of the two circular bases. 4. **Substituting the height in the formula**: - For the combined cylinder, the height is \( 2h \), so we substitute \( h \) with \( 2h \): \[ \text{TSA} = 2\pi r (2h) + 2\pi r^2 = 4\pi rh + 2\pi r^2 \] 5. **Compare with the given statement**: - The statement claims that the total surface area is \( 4\pi h + 4\pi r^2 \). - Our calculation shows that the total surface area is \( 4\pi rh + 2\pi r^2 \). 6. **Conclusion**: - Since \( 4\pi rh + 2\pi r^2 \) is not equal to \( 4\pi h + 4\pi r^2 \), the statement is **False**. ### Final Answer: **False**
Promotional Banner

Topper's Solved these Questions

  • SURFACE AREA AND VOLUME

    CBSE COMPLEMENTARY MATERIAL|Exercise VERY SHORT ANSWER TYPE QUESTIONS (CHOOSE THE CORRECT ANSWER)|10 Videos
  • SURFACE AREA AND VOLUME

    CBSE COMPLEMENTARY MATERIAL|Exercise VERY SHORT ANSWER TYPE QUESTIONS|11 Videos
  • SURFACE AREA AND VOLUME

    CBSE COMPLEMENTARY MATERIAL|Exercise VERY SHORT ANSWER TYPE QUESTIONS (FILL IN THE BLANKS)|9 Videos
  • STATISTICS

    CBSE COMPLEMENTARY MATERIAL|Exercise Practice -Test|5 Videos
  • TRIANGLE

    CBSE COMPLEMENTARY MATERIAL|Exercise Short Answer Type Questions-II|25 Videos

Similar Questions

Explore conceptually related problems

A solid cylinder of radius r and height h is palced over other cylinder same height and radius . The total surface area of the shape so formed is 4pirh + 4 pir^(2) .

Asolid cone of radius r and height h is placed over a solid cylinder having same base radius and height as that of a cone,. The total surface area of the combined solid is pi [sqrt(r^(2) + h^(2)) +3r +2h]

Total surface area of a cylinder of radius h and height r is _________

Curved surface area of a cylinder of radius h and height r is _______.

The total surface area of a cylinder of base radius r and height h is______.

Volume of a cylinder with radius h and height r is __________.

A cylinder of same height and radius is placed on the top of a hemisphere. Find the curved surface area of the shape if the length of the shape by 7cm.

If the sum of radius and height of a solid cylinder is 20 cm and its total surface area is 880 cm^2 then its volume is:

For a cylinder of base radius (=r) and height (=h), the volume is ___ cu.units