Final answer:
The angle of elevation from the ground to the plane is approximately 11.3 degrees.
Step-by-step explanation:
To find the angle of elevation from the ground to the plane, we need to use the concept of right triangles. The distance the plane flies in a straight line is the hypotenuse of the triangle, and the altitude gained is the opposite side.
We will use the tangent of the elevation angle:
Tan(angle) = opposite/hypotenuse
Angle = arctan(opposite/hypotenuse)
In this case, the opposite side is 800 feet and the hypotenuse is 4000 feet. Plugging the values into the formula, we will get:
Angle = arctan(800/4000) = arctan(0.2) = 11.3°
Therefore, the angle of elevation from the ground to the plane is approximately 11.3 degrees.