Math Problem Statement

There are many cylinders with a height of 9 inches. Let r represent the radius in inches and V represent the volume in cubic inches. (Refer to the table in the previous question if necessary.) Is there a linear relationship between the radius and the volume of these cylinders? Explain how you know.

Solution

In this case, the problem involves determining the relationship between the radius rr and the volume VV of cylinders with a fixed height of 9 inches. To complete the table, we'll use the formula for the volume of a cylinder:

V=πr2hV = \pi r^2 h

Where:

  • VV is the volume,
  • rr is the radius,
  • hh is the height of the cylinder (which is 9 inches).

Let's calculate the volume for the three given radii:

When r=1r = 1:

V=π(1)2×9=9πV = \pi (1)^2 \times 9 = 9\pi

When r=2r = 2:

V=π(2)2×9=36πV = \pi (2)^2 \times 9 = 36\pi

When r=3r = 3:

V=π(3)2×9=81πV = \pi (3)^2 \times 9 = 81\pi

Now, the table should look like this:

\hline r & V \\ \hline 1 & 9\pi \\ 2 & 36\pi \\ 3 & 81\pi \\ \hline \end{array}$$ ### As for the question about whether there's a linear relationship: - The volume of the cylinder increases quadratically with respect to the radius, as shown by the volumes calculated. This suggests that the relationship between radius and volume is not linear. - If it were linear, the volumes would increase in equal steps for equal changes in the radius. However, the volumes for $$r = 1, 2, 3$$ (9π, 36π, 81π) increase by varying amounts, showing a quadratic rather than linear relationship. Would you like more details or have further questions about this problem? Here are 5 related questions to deepen your understanding: 1. How does changing the height of a cylinder affect the volume if the radius is fixed? 2. What happens to the relationship between radius and volume if we plot the data on a graph? 3. What is the difference between linear and quadratic growth? 4. Can you calculate the volume of a cylinder if you know the radius and height in different units (such as cm or meters)? 5. How would the formula for volume change if the cylinder were hollow instead of solid? Tip: Always check whether the relationship between variables is linear or non-linear before trying to make predictions or conclusions based on the data!

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Geometry
Volume of a Cylinder
Quadratic Functions

Formulas

V = πr²h

Theorems

Volume of a Cylinder

Suitable Grade Level

Grades 7-9