A ladder 9m long leans against a vertical wall, making an angle of 64° with the horizontal ground. calculate correct to one decimal place, how far the foot of the ladder is from the wall.
-
4.0m
- 5.8m
- 7.1m
- 8.1m
- 18.5m
The correct answer is: A
Explanation
cos 64° = x/9
x = 9 cos 64°
=3.94 ≅ 4.0m