Prove Analytically that a radius drawn perpendicular to a chord of a circle bisects that chord.

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- Nov 21st 2007, 02:19 AMthe_rookie07Can u guys Help me with this circle proof
Prove Analytically that a radius drawn perpendicular to a chord of a circle bisects that chord.

- Nov 21st 2007, 05:42 AMkalagota
try to draw it..

let AB be on the circle and segment ab be the chord..

let**r**be the radius of the circle with center C..

draw the perpendicular line from C to the chord AB.. let the intersection be M.. draw triangles CAM and CBM.. note that this forms right triangles whose hypotenuses are CA and CB respectively (whose lengths are both r) .. also, they have common side CM.. you can use Pythagorean Theorem to show that AM and BM are equal in length.., that is CA^2 = CM^2 + MA^2 and CB^2 = CM^2 + MB^2, then MA = MB.. - Nov 21st 2007, 07:51 AMthe_rookie07
kool thanks man...appreciate the help