Posted by **Math** on Thursday, March 1, 2012 at 3:41pm.

chung ho is standing on the top of a building that is 135m tall. The angle of depression to the top of the building next door is 71 degrees. The angle to the base of the building is 77 degrees. The buildings are 31m apart. How tall is the other building?

thanks for your help.

- geometry -
**Steve**, Thursday, March 1, 2012 at 4:31pm
if the height is h,

(135-h)/31 = tan 19°

it doesn't really matter what the angle to the base is, but we'd better have tan 77° = 135/31

- geometry - correction -
**Steve**, Thursday, March 1, 2012 at 4:37pm
(135-h)/31 = tan 71°

h = 44.96

probably use h=45m

135-45 = 90

90/31 = 2.90 = tan 71°

- geometry -
**Math**, Friday, March 2, 2012 at 1:47am
ok ty

## Answer this Question

## Related Questions

- Math 11 - Chung-ho is standing on the top of a building that is 135 m talk. The ...
- Maths - Standing on top of a slope of 5 degrees, i see the top of a building and...
- geometry - From an apartment window 24 m above the ground, the angle of ...
- Algebra 2 - Can someone please explain how to do this problem? A 450 foot tall ...
- Per Calculus - A surveyor is standing 50 feet from the base of a building. The ...
- Math - Fred was measuring the height of a building. He stood standing at some ...
- math - Standing on the top of a building, Eric spots his friend's car at an ...
- geometry - Two buildings are separated by an alley. Joe is looking out of a ...
- Pre calculus - From h a point A that is 10 meters abov level ground, the angle ...
- Pre-Calculus - 1.The angle of elevation to top of a building from a point on the...

More Related Questions