Find the surface area of the cone z=2sqrt(x^2+y^2) and above a region in the xy-plane with area 5.

If anyone could help me with this problem, I would really appreciate it.

Thanks.

John Marcum

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- July 30th 2006, 07:11 PMOntarioStudSurface Area Question
Find the surface area of the cone z=2sqrt(x^2+y^2) and above a region in the xy-plane with area 5.

If anyone could help me with this problem, I would really appreciate it.

Thanks.

John Marcum - July 31st 2006, 04:50 AMearbothQuote:

Originally Posted by**OntarioStud**

as you may know the term describes the distance between the origin and a point in the xy-plane.

If you draw a plane cut through the cone along the z-axis it'll look like the diagram which I attached.

With your cone you get: .

The slope s is .

The surface area of a cone contains the base circle and the area, which is produced by the sloping line:

Notice: I've corrected my mistake. I'm sorry if the previous result caused any irritation.

Simplify to:

This surface has the value 5. So you get: . Solve for r and re-substitute. You'll get the equation:

Greetings

EB - July 31st 2006, 10:51 AMThePerfectHacker
earboth which software you use for functions of two variables?

- July 31st 2006, 09:19 PMearbothQuote:

Originally Posted by**ThePerfectHacker**

Derive 6

Greetings

EB