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I had an exam conversion problem:

A position vector (between the origin and point (5,2,3) is expressed as r = 5x+2y+3z. Express this vector in cylindrical coordinates.

row = SQRT(5^2 + 2^2) = 5.385

Fie = tan-1(2/5) = 21.8 degrees

Z = Z.

This was a multiple choice test and the answers were:

A) r=2.232r+0.134(theta)+3(fie)

B) r=0.5(row)-0.866(fie)+3z

C) r=5.385(row)+3z

D) None of the above

I chose D, because the correct value of fie is not there and A is sypherical.. But, I got it wrong and the correct answer is said to be C.

I wanted to check with you guys first before going to the professor but is there something I missed??

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# Homework Help: Convert this please

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