The angle of elevation of a ladder leaning against a wall is $60^\circ$ and the foot of the ladder is 6.5 m away from the wall. The length of the ladder is:
Answer & explanation
Correct answer: option 4
⇒ cos\({60}^\circ\) = \(\frac{6.5}{AC}\)
⇒ \(\frac{1}{2}\) = \(\frac{6.5}{AC}\)
⇒ AC = 6.5 x 2 = 13m
Therefore, length of ladder is 13m.