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Let AB and CD be parallel chords of a ci...

Let AB and CD be parallel chords of a circle with centre O; M is the mid point of AB and N is the mid point of CD. Prove that O,N,M are to lines.If MN = 3cm , AB = 4cm, CD = 10cm. find the radius of circle.

Text Solution

Verified by Experts

ON`bot`CD
OM`bot`AB
so, ONM are on same line.
In`/_ONC`
by pythagorus theoram
`OC^2=ON^2+CN^2`
`r^2=x^2+5^2`
`r^2=x^2+25`
...
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