A builder pushes

a wheelbarrow loaded with
sand ,from rest at point A,up a
ramp of unknown length ,which
is inclined at unknown
angle ,vertical height of unknown
2,75m

To determine the angle and length of the ramp, we need more information. However, I can explain the general concept of how to calculate these values.

To determine the angle of the ramp, we can use trigonometry. The angle can be found by taking the inverse tangent (arctan) of the ratio of the vertical height to the horizontal length of the ramp. In this case, if we have the values for both the vertical height and horizontal length, we can use the formula:

angle = arctan(vertical height / horizontal length)

To find the length of the ramp, we need additional information. Usually, we need either the angle of the ramp or the horizontal length. If we have either of these values, we can find the missing value using either trigonometry or basic geometry. For example, if we know the angle of the ramp and the vertical height, we can use the formula:

length = vertical height / sin(angle)

If we know the horizontal length and the angle of the ramp, we can use the formula:

length = horizontal length / cos(angle)

Without knowing at least one of these values, we won't be able to determine the exact length of the ramp in this situation. It's important to have more information to accurately solve the problem.