Question

In the figure o is the centre and AD is the diameter of the circle. B and C are two points on it.
Angle DOB = 50°
Angle AOB = --------- { angle AOB and angle BOD are linear pair}.
Write the relation between angle OAB and angle OBA
(Angle DOB is the outer angle at the corner O of the triangle AOB )
Write the suitable name of triangle AOB
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Like this, find the angle OAC.
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Answer 1

I want the answer you are fooling us

Answer 2

Answer:

$< 21346913362 \sqrt{666 \sqrt[6696366163]{6} } \times \frac{6 \sqrt{?} }{53}$