Math Problem Statement

Zrób i wytłumacz

Zrób i wytłumacz

Solution

The image shows a cylinder with radius r=4r = 4, height hh, and the following conditions:

  • Pb=PpP_b = P_p: This indicates that the perimeter (circumference) of the base is equal to the perimeter (circumference) of the side. We'll calculate both.
  • We are asked to find the volume VV and the lateral surface area PcP_c of the cylinder.

Step-by-step solution:

  1. Determine the height hh:

    From the condition Pb=PpP_b = P_p, the circumference of the base equals the perimeter of the side of the cylinder: Pb=2πrP_b = 2\pi r The lateral perimeter (side) of the cylinder is: Pp=hP_p = h Since Pb=PpP_b = P_p, we set: 2πr=h2\pi r = h Substituting r=4r = 4: 2π(4)=h2\pi(4) = h h=8πh = 8\pi So, the height hh of the cylinder is 8π8\pi units.

  2. Volume of the cylinder VV:

    The volume of a cylinder is given by the formula: V=πr2hV = \pi r^2 h Substituting r=4r = 4 and h=8πh = 8\pi: V=π(4)2(8π)V = \pi (4)^2 (8\pi) V=π(16)(8π)V = \pi (16)(8\pi) V=128π2V = 128\pi^2 The volume of the cylinder is 128π2128\pi^2 cubic units.

  3. Lateral surface area PcP_c:

    The lateral surface area of the cylinder is given by: Pc=2πrhP_c = 2\pi r h Substituting r=4r = 4 and h=8πh = 8\pi: Pc=2π(4)(8π)P_c = 2\pi(4)(8\pi) Pc=64π2P_c = 64\pi^2 So, the lateral surface area PcP_c is 64π264\pi^2 square units.

Summary:

  • Height h=8πh = 8\pi units
  • Volume V=128π2V = 128\pi^2 cubic units
  • Lateral surface area Pc=64π2P_c = 64\pi^2 square units

Would you like more details or have any questions?


Here are 5 related questions you might want to explore:

  1. What is the total surface area of the cylinder (including both bases)?
  2. How would the volume change if the radius were doubled but the height remained the same?
  3. Can you derive the formula for the height from the perimeter condition Pb=PpP_b = P_p?
  4. How does the volume of a cylinder compare to the volume of a cone with the same radius and height?
  5. What is the lateral surface area in terms of decimal approximations (without using π\pi)?

Tip: Always check units and dimensions carefully to ensure your formula fits the situation.

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Math Problem Analysis

Mathematical Concepts

Geometry
Cylinders
Perimeter
Volume

Formulas

Perimeter of a circle (P_b) = 2πr
Lateral perimeter (P_p) = h
Volume of a cylinder (V) = πr^2h
Lateral surface area of a cylinder (P_c) = 2πrh

Theorems

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Suitable Grade Level

Grades 9-11