In circle D, the radius DA is 9 mm and the tangent line AB = 12 mm.
Find DB
Answer:
DB is 15 mm
Step-by-step explanation:
Due to pythagoras theorem
[tex]db ^{2} = da ^{2} + ab ^{2} [/tex]
[tex]db {}^{2} = 9 {}^{2} + 12 {}^{2} [/tex]
[tex]db = \sqrt{225} [/tex]
db=15