What is the sum of the angel measures of a triangle ?

here is a answer

Step-by-step explanation:

There is also a connection betweenmultiplication of complex numbers and polar coordinates. As usual, polar coordinates of a point ( x , y ) in the plane are defined as ( r , θ ) where r is the length of the vector ( x , y ) and θ is the angle this vector makes with thepositive x axis.

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