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December 19, 2014

December 19, 2014

Posted by **Faw** on Thursday, August 7, 2014 at 6:33am.

- math -
**Reiny**, Thursday, August 7, 2014 at 8:15amLet P be the foot of the tower, and h be the height of the tower

let AP = x , then BP = 80-x

I see two right-angled triangles

tan21 = h/x ---> h = xtan21

tan46 = h/(80-x) --> h = (80-x)tan46

xtan21 = (80-x)tan46

xtan21 = 80tan46 - xtan46

xtan21 + xtan46 = 80tan46

x(tan21 + tan46) = 80tan46

x = 80tan46/(tan21 + tan46) ----- I have not yet touched a calculator

you do the button pushing to get x

then plug x into

h = xtan21

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