Question

plz ans. the following 1 question thanx the above question which is full

Answer 1

Given OD=8cm
          OB=13cm

Firstly find DB.
Using Pythagoras Theorem, DB^2=OB^2 - OD^2. This gives DB = sqrt(105) = DE.

Without going into the complexity of angles, as in some of the existing answers, I would suggest using the property of Similar triangles. Clearly, AEB and ODB are similar right triangles. And as, DB~EB, therefore, AE~OD.

DB = sqrt(105), and EB = 2(sqrt(105))
and
as OD = 8cm, therefore AE = twice(8cm) = 16cm.

Finally, using Pythagoras Theorem in right triangle AED, 
AD^2 = AE^2 + ED^2= 256 + 105= 361
Therefore, AD = sqrt(361) = 19cm.

Answer 2

hey mate
here's the solution