the angle of elevation would be the angle between the horizon and the line of sight to whatever object you are measuring to. Lets say for instance that you see a plane, and you determine that it has an angle of elevation of 30 deg. This means that from the horizon, you would need to look up at an angle of 30 degrees to see that plane. below I linked to a diagram which illustrates it quite well. Hope this helped!
It means a corner, or a plane angle.
Any space can be divided into 4 quadrants basically using two mutually perpendicular planes - the horizontal plane(HP) and the vertical plane(VP). These planes are considered to be transparent and to be of infinite size. In first angle projections, the object is considered to be in front of VP and above HP. Hence the top view or plan of the object will be obtained below the reference line and the front view or elevation above the reference line. In third angle projections, the object is said to be behind VP and below HP. hence the top view or plan will be obtained above the reference line and the elevation below the reference line.
It depends on the angle of attack of the wing.
MMPA stands for maxillary mandibular plane angle.
The angle of friction is defined as the angle of a plane where a body placed on the plane will start to slide.
normally above 10,000 feet and below 41,000 feet above sea level
the angle of elevation would be the angle between the horizon and the line of sight to whatever object you are measuring to. Lets say for instance that you see a plane, and you determine that it has an angle of elevation of 30 deg. This means that from the horizon, you would need to look up at an angle of 30 degrees to see that plane. below I linked to a diagram which illustrates it quite well. Hope this helped!
"Perpendicular" means at an angle of 90° to a given line, plane, or surface.
Light is reflected from plane surfaces in accordance with the law of reflection, which states that the angle of incidence is equal to the angle of reflection. This means that when light hits a plane surface, it bounces off in a predictable manner, maintaining the same angle with respect to the surface normal.
All sections are obtained when a plane intersects the cones.If the plane is parallel to the plane of the circle which generates the cones the section will be a circle.If the plane is inclined to the above plane at an angle that is less than the angle of inclination of the cone, you will get an ellipse.When the inclination of the plane equals the inclination of the cone you will get a parabola.Finally, if the inclination of the plane is greater than the inclination of the cone, you will get a hyperbola.
The angular distance of the horizon below the plane of observation caused by the curvature of the Earth's surface is called the dip angle.