Finding the area between curves

In summary, the conversation is about finding the area of a sketch and the correct answer is 4pi/21. One person explains to the other that they need to find the volume on Y = X and Y = X^3 and subtract them from each other. They also mention using the equation A = pi * y^2 and finding the final volume by subtracting the two previous volumes.
  • #1
FARADAY JR
21
0

Homework Statement



sketch and find the area : y=X^3, Y=X, X>/ 0

Homework Equations





The Attempt at a Solution


I'm getting pi(1/10)
but the right answer is 4pi/21 so can anyone explain to me what am doing wrong? thankx
 

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  • #2
I figured out what you did wrong.

You need to find the volume on Y = X and Y = X^3 and subtract one from the other.

So you know A = pi * y^2.

V = (pi)Integral(0,1) y^2 dx

So for Y = X you get V = (pi) * 1/3
for Y = X^3 you get V = (pi)* 1/7

Subtract volume 2 from volume 1 you get

V_Final = (pi) (1/3 - 1/7) = (pi) 4/21.
 
Last edited:
  • #3
thank you, so i found that my mistake was not setting up the problem, it was the LCD. thanks a lot.
 

FAQ: Finding the area between curves

What is the concept of finding the area between curves?

The concept of finding the area between curves involves calculating the area enclosed by two curves on a graph. This can be done by finding the points of intersection between the curves and using integration to calculate the area under the curves between these points.

Why is finding the area between curves important?

Finding the area between curves is important in many fields, including mathematics, physics, and engineering. It allows us to determine the total amount of space enclosed by two curves and can be used to solve real-world problems such as calculating the volume of irregularly shaped objects.

What is the general process for finding the area between curves?

The general process for finding the area between curves involves the following steps:

  • Plot the two curves on a graph
  • Identify the points of intersection between the curves
  • Set up an integration equation to calculate the area under the curves between these points of intersection
  • Solve the integration equation to find the area

What are some common methods for finding the area between curves?

Some common methods for finding the area between curves include using basic integration techniques, such as the definite integral, the trapezoidal rule, and the midpoint rule. More advanced techniques, such as the Simpson's rule and the Monte Carlo method, can also be used for more complex curves.

Are there any limitations to finding the area between curves?

Yes, there are some limitations to finding the area between curves. One limitation is that the curves must be continuous and have defined limits for the integration to work. Additionally, the curves must not intersect more than twice in the given interval, and they should not overlap. In some cases, it may be impossible to find an exact solution, and approximate methods may need to be used.

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