Question

the radius of circle O is 20, and OC= 8. find AB.

Answer 1

state complete question .. or draw/attach.. if there is a diagram

Answer 2

given
OC=8
OA=20
AB=?

Answer 3

here AB = 2AC

also use pythogarass theorem for rt angled triangle OAC

Answer 4

now
OA^2 = OC^2 +AC^2
so
400 = 64 + AC^2

Answer 5

OA = radius of circle...