What is the magnitude of the displacement of the plane (in meters) during the period of observation?

A radar station detects an airplane approaching directly from the east. At first observation, the range to the plane is 374.0 m at 44.0 ° above the horizon. The plane is tracked for another 120.0 ° in the vertical east-west plane, the range at final contact being 942.6 m. What is the magnitude of the displacement of the plane (in meters) during the period of observation? PHYSICS HELP PLEASE

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