Math Problem Statement

The height of cylinder A is 6 cm and the height of cylinder B is h cm. The volume of cylinder A is 170 cm^3 and the volume of cylinder B is 573.75 cm^3. What is the value of h? a) 4 cm b) 9 cm c) 12 cm d) 20.25 cm What type of problem is it? Fluency, understanding, reasoning or problem solving.

Solution

This problem involves comparing the volumes and heights of two cylinders. We need to find the height hh of cylinder B, given its volume and the known volume and height of cylinder A. Here's the step-by-step solution:

Step 1: Recall the formula for the volume of a cylinder

The volume VV of a cylinder is given by: V=πr2hV = \pi r^2 h where rr is the radius of the cylinder and hh is its height.

Step 2: Relate the volumes of cylinders A and B

Let rr be the radius of both cylinders since it is not specified that the radii differ. We have:

  • Volume of cylinder A, VA=170 cm3V_A = 170 \text{ cm}^3
  • Height of cylinder A, hA=6 cmh_A = 6 \text{ cm}

So, 170=πr26170 = \pi r^2 \cdot 6 Solving for r2r^2, we get: r2=1706πr^2 = \frac{170}{6\pi}

Step 3: Use the radius to find the height of cylinder B

The volume of cylinder B is given as 573.75 cm3573.75 \text{ cm}^3: 573.75=πr2h573.75 = \pi r^2 \cdot h Substitute r2=1706πr^2 = \frac{170}{6\pi}: 573.75=π(1706π)h573.75 = \pi \left(\frac{170}{6\pi}\right) \cdot h Simplifying: 573.75=1706h573.75 = \frac{170}{6} \cdot h h=573.756170=20.25 cmh = \frac{573.75 \cdot 6}{170} = 20.25 \text{ cm}

Thus, the height of cylinder B is h=20.25 cmh = 20.25 \text{ cm}.

Problem Type

This problem is primarily an example of problem-solving since it involves applying known formulas, performing algebraic manipulations, and logical reasoning to find the answer.

Answer

The correct answer is: d) 20.25 cm


Would you like more details or have any other questions?

Related Questions

  1. How would the answer change if the radius of cylinder B was different from cylinder A?
  2. What is the relationship between the volumes of cylinders with the same radius but different heights?
  3. Can you find the radius of cylinder A given the information above?
  4. How does changing the height affect the volume of a cylinder if the radius remains constant?
  5. What are the implications for surface area when the height of a cylinder changes?

Tip

Always remember to check if other variables (like radius in this case) remain constant when comparing geometric figures. This simplifies calculations significantly.

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Math Problem Analysis

Mathematical Concepts

Geometry
Cylinders
Algebra
Volume calculation

Formulas

V = πr²h (Volume of a cylinder)

Theorems

Proportional relationships between volume and height for cylinders with the same radius

Suitable Grade Level

Grades 8-10