The angle of elevation of the top and bottom of flagstaff fixed on wall are60°and45°to a man standing on the other side of the road 20m wide find the height of the flagstaff
Answers
Answered by
21
Hiiii.....
![h = 20( \sqrt{3} - 1) h = 20( \sqrt{3} - 1)](https://tex.z-dn.net/?f=h+%3D+20%28+%5Csqrt%7B3%7D++-+1%29)
Attachments:
![](https://hi-static.z-dn.net/files/d6e/55c6f11333891e3432b0f78e68c7b7e9.jpg)
GB2010:
my answer is right first..
Answered by
20
From the figure attached in the picture.
In ∆BCD
Apply Tan45°
we get Tan45° = x/20
=> x = 20m
Now In ∆ ACD
Tan60° = y+x/20
=> √3 = y/20+1
=> y/20 = √3-1
=> y = 20(√3-1)
In ∆BCD
Apply Tan45°
we get Tan45° = x/20
=> x = 20m
Now In ∆ ACD
Tan60° = y+x/20
=> √3 = y/20+1
=> y/20 = √3-1
=> y = 20(√3-1)
Attachments:
![](https://hi-static.z-dn.net/files/dd1/e6fd9453603731984e2b47346b88431b.jpg)
Similar questions