Transforming Cone Line Elements: Proving Flat Geometry?

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SUMMARY

The discussion focuses on transforming the cone defined by the equation z = √(x² + y²) into new coordinates ρ and φ, where x = ρ cos φ and y = ρ sin φ. The derived line element on the cone is ds² = 2dρ² + ρ²dφ², which demonstrates that the cone exhibits flat geometry. This transformation is crucial for understanding the geometric properties of conical surfaces in differential geometry.

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Homework Statement


Consider the cone defined by z = √ x 2 + y 2 . By defining new coordinates ρ, φ where x = ρ cos φ, y = ρ sin φ, show that the line element on the cone is ds^2 = 2dρ^2 + ρ^2dφ^2 . Why does this result prove the cone has flat geometry?

Homework Equations


x=rcosφ
y=rsinφ

The Attempt at a Solution


ive tried several times but end up with cos and sin in my answer
 
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No one can help you if you don't show your attempted solution. (And yes, now would be a good time to start learning how to do latex on this forum.)
 

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