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In the given figure, RA=SA=9 cm and QA=7 cm.If PQ is the diameter, then find the radius.

 

 Feb 5, 2021
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Using  the intersecting chord theorem

 

RA * SA  = PA  * QA

 

7  * 7   =  PA  *  9

 

49  = PA * 9

 

49/9  = PA

 

PA + QA   =   49/9  +  9   =   [ 49 + 81]  /  9    = 130 / 9   = the diameter

 

So......the radius    =  1/2 of this  =  130  /18   =   65 / 9

 

 

cool cool cool

 Feb 5, 2021

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