First slide

Trignometry

Question

Bottom end of a ladder leaning against a wall is 3 m away from the foot of the wall as shown in figure, length of the ladder is:

Moderate

A

8 m
B

5 m
C

4 m
D

6 m

Solution

Let length of ladder be l then $\frac{3}{l} = \cos 53 °$
⇒ l=5m

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