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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.)
Each of the interior angles of an equilateral triangle is 120 degrees.
Each angle of an equilateral triangle measures 60 degrees. They are all the same.
An equilateral triangle.
A triangle with the third angle that measures 30 degrees.This triangle is not isosceles nor equilateral but has one obtuse angle.