A ladder is resting against a wall. The angle between the foot of the ladder and the wall is 60°, and the foot of the ladder is 3.6 m away from the wall. The length of the ladder (in m) is :
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Correct answer: D
Explanation
The correct answer is Option 4 i.e. 7.2.
In △PQR
⇒ cos 60° = 1/2
⇒ cosθ = B/H = QR/PR
⇒ 1/2 = 3.6/AC
⇒ AC = 7.2 cm