Question

Need help on circle work

Please help me . I don't understand how to do this work.

Answer 1

Explanation:

Radius = OC = OD + DC = 6 + 4 = 10

In ΔODB, OB = radius = 10, OD = 6, so

`DB=√(OB^2-OD^2)=√(10^2-6^2)=8\\`

Similarly, AD = 8

Then AB = AD + DB = 16