Q. 85.0( 1 Vote )

Let AC be the length of the ladder.

AB is the distance between the foot of the ladder and the wall = 12m

In ΔABC,

cos 30° =

cos 30° =

From cosine table, cos 30° = 0.8660

0.8660 =

AC = = 13.856 m

The length of the ladder is 13.856 m.

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