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The question is given in the following picture:

enter image description here

I know that the triangle ABC will be an isosceles triangle but I do not know how to use this knowledge in the solution, could anyone help me please ?

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    $\begingroup$ What shape are the triangles $OAB$ and $OAC$? $\endgroup$
    – Angina Seng
    Jul 22, 2017 at 14:41
  • $\begingroup$ @LordSharktheUnknown equilateral triangles. yeah I got it. $\endgroup$
    – Emptymind
    Jul 22, 2017 at 14:45
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    $\begingroup$ So the quadrilateral $OBAC$ is two equilateral triangles stuck together. $\endgroup$
    – Angina Seng
    Jul 22, 2017 at 14:46
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    $\begingroup$ Could you please name your questions so they refer to the topic they are about instead of impenetrable reference codes for where in some unspecified filing system you found the problem that prompted you to ask? Thank you. $\endgroup$
    – hmakholm left over Monica
    Jul 22, 2017 at 14:49
  • $\begingroup$ ok I will do @HenningMakholm $\endgroup$
    – Emptymind
    Jul 22, 2017 at 14:50

1 Answer 1

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HINT

Let the radius of the two circles to be $r$, then $OA=OB=OC=r=AO=AB=AC$

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