If a line OP of length r (where, O is the origin) makes an angle alpha with X-axis and lies in the XZ-plan

### Question Asked by a Student from EXXAMM.com Team

Q 2319134019.     If a line OP of length r (where, O is the origin)
makes an angle alpha with X-axis and lies in the
XZ-plane, then what are the coordinates of P?
NDA 2012 Paper 1
A

(r cos alpha , 0, r sin alpha)

B

(0, 0, r sin alpha)

C

(r cos alpha , 0, 0)

D

(0, 0, r cos alpha)

#### HINT

(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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