\newcommand{\sinefunction}{\color{c1}}
\newcommand{\thetacolor}{\color{c2}}
\newcommand{\opposite}{\color{c3}}
\newcommand{\hypotenuse}{\color{c4}}
\plain In a right triangle, pick \thetacolor an angle:
\
\sinefunction sine \plain is the \opposite opposite side
\plain as a
\
\hypotenuse percent of the largest side