<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br><div><div>On Nov 30, 2011, at 7:11 AM, frank weytjens wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; font-family: 'Lucida Grande'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div>(define (in-circle? C pos)</div><div>  (> (cirkel-number C) (distance-to-center C pos)))</div></span></blockquote><br></div><div>If a math teacher asked you to determine whether a point was (strictly) within a circle, he'd write </div><div><br></div><div>  |p - c| < r</div><div><br></div><div>Somewhere else he'd define </div><div><br></div><div>                  ____________________________</div><div> |p - c| = \/ (p.x - c.x)^2 + (p.y - c.y)^2</div><div><br></div><div>and somewhere else he'd define </div><div><br></div><div> foo.x extracts the x component from a Cartesian point foo</div><div><br></div><div>You wrote exactly the same though with bad choices for the names and with a bad ordering of material.</div><div><br></div><div>What part are you unhappy about? </div><div><br></div><div>-- Matthias</div><div><br></div></body></html>