Finding the Equation of the Hypotenuse of a Triangle in Multi-Variable Calculus

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Homework Help Overview

The discussion revolves around evaluating a double integral over a triangular region defined by specific vertices in a multi-variable calculus context. Participants are focused on determining the correct bounds for the integral based on the geometry of the triangle.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants are discussing the appropriate bounds for the double integral, with one participant initially suggesting bounds that would apply to a rectangular region. There is a question regarding the equation of the hypotenuse of the triangle, with attempts to derive it leading to confusion with a circular equation.

Discussion Status

The discussion is ongoing, with participants exploring different interpretations of the problem. Some guidance has been offered regarding the nature of the hypotenuse, indicating that the current understanding may need to be reassessed.

Contextual Notes

There is a noted misunderstanding regarding the geometry of the triangle, particularly in distinguishing between the equation of a line segment and that of a circle. This may affect the determination of the correct bounds for the integral.

Larrytsai
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Homework Statement


Evaluate the double integral I=int(int(D)( xydA) where D is the triangular region with vertices (0,0)(5,0)(0,3).


The Attempt at a Solution



I was wondering if my bounds for x would be 0 to 5 and y to be 0 to 3
 
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Larrytsai said:

Homework Statement


Evaluate the double integral I=int(int(D)( xydA) where D is the triangular region with vertices (0,0)(5,0)(0,3).


The Attempt at a Solution



I was wondering if my bounds for x would be 0 to 5 and y to be 0 to 3
No they wouldn't. If the region were a rectangle, those would be the bounds, but your region is a triangle. Think about the equation of the hypotenuse of the triangle.
 
k so my hypotnuse is x^2+y^2 = sqrt(34), then i isolate for x and have x=sqrt(sqrt(34)-y^2) so my bounds for x would be 0 to x=sqrt(sqrt(34)-y^2) , and y would be 0 to 3
 
Larrytsai said:
k so my hypotnuse is x^2+y^2 = sqrt(34), then i isolate for x and have x=sqrt(sqrt(34)-y^2) so my bounds for x would be 0 to x=sqrt(sqrt(34)-y^2) , and y would be 0 to 3
That is NOT the equation of the hypotenuse of the triangle - it's the equation of a circle centered at the origin.

The hypotenuse of the triangle is a straight line segment. Do you know how to find the equation of a line?
 

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