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

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

Construct an equilateral triangle, given its side and justify the construction.

Construct an angle of measure 90^(@) and divide it into three equal angles .

To construct an angle of 22frac(1_@)(2) we

Using ruler and compasses, construct the following angles and justify your construction : 120^@

Using ruler and compasses, construct the following angles and justify your construction : 150^@

Using ruler and compasses, construct the following angles and justify your construction : 165^@

Construct the angles of the following measurement 30^@ .

Construct the angles of the following measurement 15^@ .