WAEC - Mathematics (1988 - No. 10)
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
Explicación
cos 64° = x/9
x = 9 cos 64°
=3.94 ≅ 4.0m