Outer view after removal of the Il.**fb**, ilio-fibularis and Il.tib, ilio-tibialis.

Representing by P this position, it follows that the area of that portion of the ellipse contained between the radii vectores **FB** and FP will bear the same ratio to the whole area of the ellipse that t does to T, the time of revolution.

Set off ab = ac = 1/2p. Draw radii bd, Ce; draw **fb**, cg, making angles of e 753/4 with those radii.

The cartesian equation to the epicycloid assumes the form x = (a +b) cos 0 - b cos (a -**Fb**/b)8, y = (a +b) sin 0 - b sin (a -1--b/b)6, when the centre of the fixed circle is the origin, and the axis of x passes through the initial point of the curve (i.e.

**Fb**, Floor board.