Can anyone pls pls check my answer to this polar equation?

Science & Mathematics by Anonymous 2018-06-29 11:34:10

Social Science

3 answers

My answer: (2.2,4.2) but I keep being told 4.2 is the wrong answer and I don't understand how its wrong

Anonymous

(x,y) → (r,θ) r = √(x²+y²) and θ = atan2(y,x) Here r = √((-1)²+(-2)²) = √5 ≈ 2.2 (which is a match), and θ = atan2(-2,-1) ≈ -2.0 radians in the range (-π,π] or 4.2 radians in the range [0,2π). Try -2.0, which is 2.0.
Anonymous

It's the minus sign. They want you to express the angle as a negative angle. θ = atan(2) + kπ θ ≈ 1.1 − π θ ≈ -2.0
Anonymous

A