# Hello,I cannot figure out what theta is.I have tried almost everything & my open math still says that my answers are wrong. Can anyone help?

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- MichaelLv 72 months agoFavorite Answer
r = √(3² + (-10²)

r = 10.44030650891055

r ≈ 10.440 <–––––

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3 - 10i therefor

ϴ is in the IV Quadrant

Reference angle

Tan ϴ = -10/3

ϴ = arctan (-10/3)

ϴ = -1.27933953231703

ϴ = 2π + -1.27933953231703

ϴ = 5.003845774862557

ϴ = 5.004 <–––––

- Anonymous2 months ago
No I can't help.

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Thank you sooooo much Michael! My open math said those answers are correct. Thank you for helping!