3. trisect means three
To trisect a right angle form an equilateral triangle with one vertex at the right angle and then bisect that angle of the equilateral triangle. (It is impossible to trisect a general angle using only compass and straight edge - the right angle is a specific exception.)
Three ! The answer is in the question !
trisect
three
trisect
Right
three
An equilateral triangle on on of the arms of the right angle.
True
to construct an angle of 20 degrees all you have to do is to trisect an angle of 60degrees
2 rays