Mr.Viet Math Academy

Mr.Viet Math Academy Innovating in the study of IB, AP, IGCSE, A Levels, SSAT, SAT to help every student excel in maths.

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29/04/2026

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Find the rate of change of the angle of elevation |👉A radar station is located on the ground. A plane is flying in a str...
23/04/2026

Find the rate of change of the angle of elevation |
👉A radar station is located on the ground. A plane is flying in a straight line at a constant height of 12 km above the ground. At time t=0, , the plane is observed at an angle of elevation of 40° from the radar station. The plane moves in such a way that the distance from the radar station to the plane, say x, is increasing at dx/dt=19 km/min. a constant rate of. Let y, be the horizontal distance of the plane from the radar station.

23/04/2026

You can try first ! Maybe your method is better.
22/04/2026

You can try first ! Maybe your method is better.

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