One end of a seesaw 3metres long makes an angle of 25 degree with the ground,how high is the other end above the ground

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Sin25*3 witch is 1,2678547852220983085609354689432 meters

Posted on Nov 24, 2008

• Imre Vetro Dec 02, 2008

There's a rule for this.

And if you had listened to the teacher instead of anything else you should know that or at least know where and what to find in the book or google it....

Get a paper and start writing down the data what you have and drow a triangle like this.
From that triangle we know that

gamma is 90 degree
alpha is 25 degree
C side is 3 meter long
a=?

sin gamma sin alpha
----------------- = ----------
c a

sin 90 sin 25
---------- = ----------
3 a

sin 90= 1

so

1 sin25
--- = ------------
3 a

1
-- a = sin25
3

a = 3 (sin25)

now grab your calculator and type in sin25*3

Guess what?

It's 1,2678547852220983085609354689432 as I told you before!

So the seesaw's other end is 1,2678547852220983085609354689432 meters above the ground.

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Posted on Jan 02, 2017

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