SOLUTION: A ladder is placed against a vertical wall with its foot on horizontal ground. If the angle of inclination of the ladder to the horizontal is 39° and the distance between the f

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Question 1200430: A ladder is placed against a vertical wall with
its foot on horizontal ground. If the angle of
inclination of the ladder to the horizontal is
39° and the distance between the foot of
the ladder and the wall is 4.7m, calculate
the length of the ladder correct to 1 d.p..
Answer by ikleyn(52778)   (Show Source): You can put this solution on YOUR website!
.
A ladder is placed against a vertical wall with its foot on horizontal ground.
If the angle of inclination of the ladder to the horizontal is 39°
and the distance between the foot of the ladder and the wall is 4.7m,
calculate the length of the ladder correct to 1 d.p.
~~~~~~~~~~~~~~~ 

Make a sketch if you need it.


You have a right angled triangle.


One its leg  "a"  is  4.7 m.
The adjacent angle  is 39°.


They want you calculate the length of the hypotenuse "c".


Write 

    cos(39°) = ,


based on the definition of cosine. 
From this equation

    c = .


Use your calculator and complete the assignment on your own.

Happy calculations (!)



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