Question

please answer this question​

Answer 1

Answer:

option b

Step-by-step explanation:

by similarity

angle A is also 90 ( angle in a semi circle)

angle D is 90 given

and angle B is common

so AA similarity

triangles BDO and BAC are similar

so corresponding sides ratio equal

OD/AC = BO/BC

6/AC =r/2r

AC= 2*6=12