Question 120
The angle of elevation of a ladder leaning against a wall is 60" i.e. ladder makes an angle of 60° with the ground. The foot of the ladder is 4.6 metres away from the wall. What is the length of this ladder ?
Solution
From the given information, Below figure is formed.
Here, $$ cos 60^\circ = \frac{Distance from foot of ladder to wall}{length of ladder} $$
=>$$\frac{1}{2} =\frac{4.6}{l} $$
=> $$l=9.2m$$
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