Solution:
Given,Radius of circle=
Drawing the required figure,
If point P is equidistant from A, B and C, then AP is the radius of the circle.
AP units.
Thus, the length of the AP units.
Hence, option 1 is correct.
Also Check:
Radius of circumcircle of a triangle ABC is units. If point P is equidistant from , and and then find AP.