A ladder of length 3.5 m just reaches the top of a wall. If the ladder makes an angle of 60° with the wall, then what is the height of the wall (in m)?
Answer & explanation
Correct answer: option 1
⇒ cos\({60}^\circ\) = \(\frac{QT}{3.5}\)
⇒ \(\frac{1}{2}\) = \(\frac{QT}{3.5}\)
⇒ QT = \(\frac{3.5}{2}\)
⇒ QT = 1.75m
Therefore, height of the wall is 1.75m.