High school basketball foul line length?

<a href="https://lamcaptoc.com/">https://lamcaptoc.com</a>; 15ft clowns<img src="https://cdn.pixabay.com/photo/2012/04/16/12/58/fire-35891_640.png"; style="max-width:430px;float:left;padding:10px 10px 10px 0px;border:0px;" alt="\u0110\u1ed3 h\u1ecda vector mi\u1ec5n ph\u00ed: L\u1eeda, Ng\u1ecdn L\u1eeda, N\u00f3ng, S\u01b0\u1edfi \u1ea4m, Cam - \u1ea2nh mi\u1ec5n ph\u00ed tr\u00ean Pixabay - 35891" />