The intersecting circlesx^2 +y^2 = 100 and (x−21)^2 +y^2 = 289 have a common chord. Find its length.

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- Mar 26th 2011, 02:11 PMthamathkid1729Intersecting CirclesThe intersecting circles
*x^*2 +*y^*2 = 100 and (*x−*21)^2 +*y^*2 = 289 have a common chord. Find its length.

- Mar 26th 2011, 02:14 PMPlato
You have enough other postings to understand that this is not a homework service nor is it a tutorial service. Please either post some of your own work on these problems or explain what you do not understand about the question.

- Mar 26th 2011, 11:16 PMmathfun
Substract the first equation from the other and you will get the equation of the common chord. Solve the system of equations of the chord and one circle and find the distance between the two points.