Which of the following constructions are crucial to draw inscribed circles on a given equilateral triangle

To draw a circle inscribed on a given triangle we usually follow the procedure given by:
construct a perpendicular line
construct another perpendicular line
where they cross is the center of the inscribed triangle. 
Place a compass at the center point and adjust it's length to one of the angles and and draw the circle.
Thus from the above we say the answer is:
Construct perpendicular