1.

ABCD is a quadrilateral, the sides of which touch a circle. Which one of the following is correct?

A.  \[AB+AD=CB+CD\] 
B.  \[AB:CD=AD:BC\]
C.  \[AB+CD=AD+BC\]  
D.  \[AB:AD=CB:CD\]
Answer» D.  \[AB:AD=CB:CD\]


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