What is the reason for the fourth & ' eighth steps in the proof?

a. sas criterion for congruent triangles.
b. alternate interior angles theorem.
c. transitive property of equality.
d. perpendicular bisector theorem.

answer: perpendicular bisector theorem

step-by-step explanation:

therefore if and ag=gc

and is the perpendicular bisector of

then by perpendicular bisector theorem, da=dc

again if and ah=hb

and is the perpendicular bisector of

then by perpendicular bisector theorem, da=db

therefore, the reason for the fourth & ' eighth steps in the proof is "perpendicular bisector theorem ".

(a) the volume of the cone is 20/3 in3

hence, option a is correct.