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Two equal circles with centres P and Q a...

Two equal circles with centres P and Q are tangent at O. A common line is tangent to both the circles at M and N respectively. Point B lies on the arc OM and point C lies on the arc ON. Points A and D lie on the tangent MN. If the radius of each circle is r and each side of the square ABCD is x, find x.

A

A) 0.25r

B

B) 0.3r

C

C) 0.33r

D

D) none of these

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D
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