While landing at an airport
Average speed of the plane was
pilot made an angle of depression of 20°
of the plane was 200Km/hour. The plane reached the
n atter 54 seconds. Find the height at which the plane was when
started landing. (Sin20º = 0.342)
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Step-by-step explanation:
Average speed of plane =200Km/hour
In triangle ABC
LB=90
AB is the height of plane
AC is distance of plane from ground
Speed=Dist./time
200=dist./54/60/60
Converting sec into hr
200(0.015)=dist.
3=dist.
AC=3
sintheeta =AB/AC
SIN20=AB/3
0.342(3)=AB
AB=1.026Km
AB=1026m
Height of the plane when it started landing is 1.026Km or 1026m
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