Convert (-5,2) to polar coordinates?

Question

Como · Answer

r²   = 25  + 4
r²   = 29
r   = √29

tan ∅   = - 2/5
∅   = 180°  -  21•8 °
∅  = 158•2°

Point √29  /_158•2°

Engr. Ronald · Answer

(-5,2)

r = √(x^2 + y^2)
r = √[(-5)^2 + 2^2]
r = 5.385

solving for the angle..

θ = tan^(-1) = y/x = 2/(-5) = 158.19°

? · Answer

r^2 = 25+4
r = √29
θ = arctan(-2/5) = 158.2°
(√29,158.2°)

alex · Answer

Rule

point (a,b)

to polar [r, θ] , with
r = √ (a^2+b^2)
θ = cos^-1 (a/r) , if a<0

Φ² = Φ+1 · Answer

r = √((-5)² + 2²) = √29 so

(-5,2) = ( √29, atan2(2, -5) ) polar ≈ (5.385, 158.2°) polar

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