the sum of all interior angles in a triangle is 180°, now, if we split that in (1+1+16) even pieces, that'd be 180 ÷ 18.
and then we give the ratio of 1, one of those pieces, the other ratio of 1, the same, and the ratio of 16, sixteen of those pieces.
[tex]\bf 1:1:16\qquad \cfrac{180}{1+1+16}\implies \cfrac{180}{18}\implies 10\quad \qquad
\stackrel{1}{10}~:~\stackrel{1}{10}~:~\stackrel{16}{160}[/tex]
