Use the parallelogram law to find the following resultants. Specify direction with an angl...

Use the parallelogram law to find the following resultants. Specify direction with an angle referenced to the positive X axis.

(a) The resultant R1,2 of forces F1 and F2

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(b) The resultant R3,4 of forces F3 and F4

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(c) Use the results of parts (a) and (b) to find the resultant of the four-force system.

Problem