a hard one

In the diagram O is the center of the circle SP and TP are the two tangents at S and T respectively. ang(SPT) = 50, then the value of ang(SQT) is :
a.  125
b. 65
c. 115
d. None of these

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here i attached figure and

here i attached figure and ans is 115
Little Star    hey dear can u tell me its right or wrong?

AttachmentSize
untitled.JPG 41.39 KB
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ans=115 

ans=115 

@jigar

Sorry yar!!!!
Answer is 115 deg...
Formula was outta my head...
Thanks
Giv ur best to d world
And d best will cm back to u...

Regards,
Dipanjan.....

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@alivia

the answer is :
c) 115

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answer

its too easy !!!!
ans is 115.
you will have to make a construction .
make a cyclic quad. with S , Q, T as the three vertices .

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