A ladder is leaning against a wall where the upper end is 4.5 m high from the ground. The angle of inclination of the ladder to the ground is . Find the length of the ladder giving the answer to two decimal places.
A building is 8.78 km tall from the ground. The angle of elevation of the top of the building from a point on the ground is . Find the distance between the point on the ground and the top of the building giving the answer to the nearest metre.