Electrical mathQuestion 156 of 1506

A vector has the rectangular form −6, j8. What is its polar form?

  1. 10 @ 53.1°
  2. 10 @ 233.1°
  3. 10 @ 306.9°
  4. 10 @ 126.9°
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Correct answer: 10 @ 126.9°

The magnitude is 10 and the calculated angle is 53.1°. In quadrant 2 the polar angle is 180° − 53.1° = 126.9°.

Source: Trigonometry and Single Phase AC Generation for Electricians (Flinn), 2.4: Vector Addition

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Questions last reviewed: 18 October 2026