Point d is the center of the inscribed circle of
abc which step can you use to draw the inscribed circle of a abc
a draw arcs of equal lengths intersecting ab, bc, and ac in two points each.
ob. draw the perpendicular bisectors of ab. bc, and ac that pass through point d.
oc label a point eon ab and draw a line joining ewith d.
d. draw a line through
that is perpendicular to one of the sides, ab bc or ac.
e
draw one arc each on ab and bc, and find their point of intersection.
reset
next

answer:

the step which is used is to construct the altitude from the incentre   to a side of triangle and label the intersection point.

step-by-step explanation:

given point d is is the center of inscribed circle.

to construct the inscribed circle of abc we have several steps of construction

step 1: first step is to construct the incenter with the of angle bisectors of two base vertices.

here given d center of inscribed circle that means the incenter given.

step 2: after incenter, draw a line perpendicular to one side of triangle that passes through incenter and the label the point of intersection.

this is very important step because after labelling measure the radius(same as the distance between the incenter and labelled point) and draw the circle.  

hence, after incenter the next step is to construct the altitude from the incentre   to a side of triangle and label the intersection point.

step 2 is used draw inscribed circle when incenter already given.

answer: -2+√x,-2-√x

i hope this , i don't know if you're looking for a pair or not.