Convert the following angles in degrees to radians: 360 ; 90 ; 60 ; 45
Convert these angles in radians to degrees: 1 rad; 0.25 rad; rad; /5 rad
An aircraft is circling above an airport. Its path has a diameter of 20km and its speed is 120m/s. How long will it take to complete one circuit of its path? In what time interval will the direction change by 30 ?