An angle cannot be formed by only one ray. However, an angle formed by two opposite rays is called a straight angle.
If you mean an angle then an angle is formed by two straight lines meeting at a vertex.
A 90 degree angle is formed at a right angle.
The angle formed by a horizontal line is 180o.
Which angle formed on rectangular field
an angle (that can be on the earth) at which an angle could be formed by the sun.
A straight angle
the angle at which a shadow is formed
It is an angle of 5 degrees.
two equal acute angles are formed.
The angle formed is 60 degrees.