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maaf kalo ga tepat ya............. soalnya kurang yakin dg jawabannya ..........
r = √(x²+y²)
r = √(-5)²+(5)² = √(50)= 5√2
tan a° = y/x = 5/-5 = - 1= - tan 45°
krn x < 0 dan y > 0 , maka a di kuadran ke II
tan a= - tan 45 = tan (180-45) = tan 135°
a = 135°
(5, -5) ---> (5√2, 135°)
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