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The resultant of two alternating sinusoidal voltages or currents can be found using ___________

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The resultant of two alternating sinusoidal voltages or currents can be found using ___________

(a) Triangular law

(b) Parallelogram law

(c) Either triangular or parallelogram law

(d) Neither triangular nor parallelogram law

I had been asked this question by my school teacher while I was bunking the class.

This interesting question is from Phasor Diagrams Drawn with RMS Values Instead of Maximum Values topic in section Alternating Voltage and Current of Basic Electrical Engineering

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Right option is (b) Parallelogram law

Explanation: The resultant current can be found by using the parallelogram law of addition  I^2 = I1^2 + I2^2 + 2I1I2 cosθ.

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