AT is a tangent at T to a circle, centre O.
OT = x cm AT = (x+5) cm OA = (x+8) cm
a) Show that x^2-6x-39=0
b) Solve the equation x^2-6x-39=0 to find the radius of the circle
Give your answer correct to 3 significant figures.
Someone please help.
Last edited by alice; November 12th 2008 at 10:08 AM.