Subject
NSI নিয়োগ
Topic
জাতীয় নিরাপত্তা গোয়েন্দা সংস্থা (NSI) (সহকারী পরিচালক) - ০৮.১০.২০২১
You are looking at a billboard 40m away with an angle of elevation of 30°. At what height is the billboard?
You are looking at a billboard 40m away with an angle of elevation of 30°. At what height is the billboard?
ক)
20খ)
30গ)
40ঘ)
50Explanation
Let, the height of the billboard is x we know, sinΘ = height/hypotenuse ⇒ sin30 = x/40 ⇒ 1/2 = x/40 x = 20Related questions
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