The rectangular box has sides of lengths , , . Find the angle between the plane and the plane (see the picture). Round the result to two decimal places.
The rectangular box has sides of lengths , , . Find the angle between the lines and , where is the midpoint of the diagonal (see the picture). Round the result to two decimal places.
The rectangular box has sides of lengths , , . Find the angle between the lines and , where is the midpoint of the diagonal (see the picture). Round the result to two decimal places.