February 23, 2017

Homework Help: math

Posted by Cynthia on Thursday, October 9, 2008 at 5:11pm.

The equation of a circle with centre O(0,0) is x^2+y^2=40. The points A(-2,6) and B(-6,-2) are endpoints of chord AB. DE right bisects chord AB at F.
a)Verify that the centre of the circle lies on the right bisector of chord AB.
b)Find the distance from the centre of the circle to chord AB, to the nearest tenth.

now, i can do the problem, but i just don't understand where i use x^2+y^2=40.. i mean what's the purpose of it??? PLEASE HELP ME!!

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