Question About Bracket Measurement

gosh durnitt...soacahtoesass! thats the last time i work trig on a 2x4 with a carpenters pencil. if that diagram is correct, and i sure it is, then if i lay my square on top of bracket it should work the same, right? well i get 3 and a half inches. thats 14 degrees of redneck deadrise (A.K.A. transom angle). sorry grace. would ya'll believe that i graduated L.S.U. with a degree in civil engineering? no...? me iether, so i won't tell that lie! but i did make it over 2 years b4 i dropped out.