Electrician and Wireman Electrical Networks Alternating Current

Which one of the following relationships is true between true power (PT), reactive power (PR) and apparent power (PA)?

1
PA = PT + PR
2
PA = PT - PR
3
\({P_A} = \sqrt {P_T^2 + P_R^2}\)
4
\({P_A} = P_T^2 + P_R^2\)

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