How to get the function ?

*To*: mathgroup at smc.vnet.net*Subject*: [mg89330] How to get the function ?*From*: Joe <Joe.Varghese.John at gmail.com>*Date*: Fri, 6 Jun 2008 06:45:33 -0400 (EDT)

Hi All, I am new to this group. Hope this is the right one. Assume a Circle with its bottom most point (-veY-axis from the center meeting with circle) as the referance point. That point is x=0, Y=0. I know the X and Y values of a point on the circle from the referance point. Let that be (X1, Y1). (Lets that point makes an angle of approx 30=B0 at the center with respect to Y axis.) My objective is to find the x and y values of a point which make a specific angle, say 60=B0. ----------------- Assume Theta1 is the Angle of (X1, Y1) and (0, 0) at the Center. Assume Theta2 is the Angle of (X2, Y2) and (0, 0) at the Center. Assume R is the Radius Known values > X1, Y1, Theta2 to find > Theta1, R Result needed > X2, Y2 ------------------ X1 = R * Sin(Theta1) R - Y1 = R * Cos(Theta1) Solving this simutanious eq gives you R. X2 = R * Sin(Theta2) Y2 = R - ( R * Cos(Theta2) ) -------------------- Now the Qn is to rearrange the first two eq, so that I can find R directly.. R = Fn( X1, Y1 ) what would be the function.............. Thanka a lot... Joe.