Construct an angle of `90^@` at the initial point of a given ray and justify the construction.

Construct an angle of 45^@ at the initial point of a given ray and justify the construction.

Construct an angle of 45^@ at the initial point of a given ray and justify the construction.

Construct an angle of 45^@ at the initial point of a given ray and justify the construction.

Construct an angle of 60^@ at the initial point of a given ray.

Construct an angle of 60^@ at the initial point of a given ray.

To construct an angle of 60^(@) at the initial point of a given ray.

Construct the following angles at the initial point of a given ray and justify the construction. 90^@

Construct the following angles at the initial point of a given ray and justify the construction. 45^@

Construct the following angles at the initial point of a given ray and justify the construction. (a) 90^(@) (b) 45^(@)