$AB$ and $CD$ are two chords of a circle which intersect at right angle at $E$. If $AE=2\ cm,EB=6\ cm,ED=3\ cm$, then radius $(r)$ is equal to:
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$AB$ and $CD$ are two chords of a circle which intersect at right angle at $E$. If $AE=2\ cm,EB=6\ cm,ED=3\ cm$, then radius $(r)$ is equal to: