Thursday

July 31, 2014

July 31, 2014

Posted by **Pauline Duma** on Monday, September 26, 2011 at 6:29pm.

- math -
**MathMate**, Monday, September 26, 2011 at 6:41pmThe height H of the building can be found from the equation:

tan(8°)=H/100

or

H=100tan(8°) ....(1)

After he "backed-up" to a distance of D from the building, the new relation with the height is:

tan(1°48')=H/D

or

D=H/tan(1°48')....(2)

So substitute H from (1) into (2) to get

D=100tan(8°)/tan(1°48')

Can you take it from here?

(The answer is around 450m)

**Related Questions**

math - john is standing 100 metres away from a building.the angle of elevationto...

Math - Fred was measuring the height of a building. He stood standing at some ...

geometry ( trigonometric ratios) - a girl who is standing 92 ft away from a ...

precal - A contractor needs to know the height of a building to estimate the ...

geometry - chung ho is standing on the top of a building that is 135m tall. The ...

maths - An observer on top of a building 66 metres high,finds the angle of ...

math - Richard is standing between two buildings in a town house development.The...

math - Richard is standing between two buildings in a town house development.The...

Math - A surveyor, standing 80 ft. from the base of a building, measures the ...

Math - Montreal’s Marathon building is 195m tall. From a point level with, and ...