Area of a 2D region (Green's Theorem)(?)

In summary, the area of the region within x3 + y3 = 3xy can be calculated by using the parametric equations x = 3t/1+t3 and y = 3t2/1+t3 and the equation for area given by Green's Theorem, which is Area = 1/2 \intx*dy - y*dx. This will result in the correct answer.
  • #1
xago
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Homework Statement


Calculate the area of the region within x3 + y3 = 3xy. It can be parametrized by [tex]\gamma[/tex]:[0,[tex]\infty[/tex]] [tex]\rightarrow[/tex] R2 with [tex]\gamma[/tex]=<3t[tex]/[/tex]1+t3, 3t2[tex]/[/tex]1+t3>.

Homework Equations



Area = 1/2 [tex]\int[/tex]x*dy - y*dx

The Attempt at a Solution



My plan is to take the curve parametrized by [tex]\gamma[/tex]=<3t[tex]/[/tex]1+t3, 3t2[tex]/[/tex]1+t3> and use the parametric equations as x = 3t[tex]/[/tex]1+t3 and y = 3t2[tex]/[/tex]1+t3. Then i simply just use the equation for area given by Green's Theorem Area = 1/2 [tex]\int[/tex]x*dy - y*dx and compute the integral. Can anyone confirm if this is right or am I way off?
 
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  • #2
That should work like a charm.:smile:
 

FAQ: Area of a 2D region (Green's Theorem)(?)

1. What is Green's Theorem?

Green's Theorem is a mathematical tool used to calculate the area of a 2D region bounded by a closed curve. It relates the area to the line integral of a vector field over the curve.

2. How does Green's Theorem work?

Green's Theorem states that the area of a 2D region R bounded by a simple closed curve C can be calculated by integrating the function (M dx + N dy) over C, where M and N are the components of a vector field and dx and dy are the differentials of x and y, respectively.

3. What are the prerequisites for understanding Green's Theorem?

To understand Green's Theorem, one must have a solid understanding of vector calculus, including line integrals, vector fields, and the concept of divergence and curl. Familiarity with double integrals and partial derivatives is also helpful.

4. What are the applications of Green's Theorem?

Green's Theorem has many applications in physics and engineering, particularly in the calculation of work done by a force field and the calculation of fluid flow. It can also be used to solve various optimization problems in economics and finance.

5. Are there any limitations to Green's Theorem?

Green's Theorem can only be applied to simple closed curves, meaning that the curve cannot intersect itself. It also assumes that the region is smoothly bounded and that the vector field is continuous on the region and its boundary. Additionally, Green's Theorem only applies to 2D regions; a similar theorem, known as Stokes' Theorem, is used for 3D regions.

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