Diagram showing straight-line paths for angles of entry into "pocket" (assumes ball is centered at board 17.5 at impact), specifically for angles of entry of 2, 4, and 6 degrees.<br><p>Round-off error in representations may result from Microsoft Powerpoint's accepting only two significant digits to right of decimal point.
</p><p>Calculations assume center of bowling ball is centered on board 17.5, and 6.38 inches up-lane from center of head pin. Board 20 is centered 41.5/2=20.75 inches from edge, minus 2.5 inches from board 20 to board 17.5 = 18.25 inches. Board 17.5 is 18.25 inches from right edge of lane.
</p>
<ul><li>18.25 / tan 2° / 12 = 43.57 feet up-lane from center of ball at impact</li>
<li>18.25 / tan 4° / 12 = 21.75 feet up-lane from center of ball at impact</li>
<li>18.25 / tan 6° / 12 = 14.47 feet up-lane from center of ball at impact</li></ul>
<a href="//commons.wikimedia.org/wiki/User:RCraig09" title="User:RCraig09">RCraig09</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>