\definefontfamily[mainface][serif][Brill]

[protrusion=quality,

expansion=quality, 

mode=node,

force=yes,

]

\definefallbackfamily[mainface][mm][TeX Gyre Pagella]

[preset=math:digitsnormal,features=f:oldstyle,scale=0.93]

\definefallbackfamily [mainface] [mm] [Brill] [preset=math:lowercasegreeknormal]

\definefallbackfamily [mainface] [mm] [Brill] [preset=math:lowercasegreekitalic]

\definefallbackfamily [mainface] [mm] [Brill] [preset=math:uppercasegreeknormal]

\definefallbackfamily [mainface] [mm] [Brill] [preset=math:uppercasegreekitalic]

\definefontfamily[mainface][mm][TeXGyre Termes Math][scale=0.94]

\setupmathematics[ucgreek=normal,lcgreek=italic]

\setupbodyfont[mainface,10pt]

\starttext

Euclid \emph{Elem}.\ 3.20 states that if \m{BC} is  joined to the center \m{O} of the circle, then \m{\angle BOC = 2\cdot\angle A},  and \m{\angle BOC} is equal to  \m{BC\kern-1em\raise1.8ex\hbox{\frown}}.%

%

\footnote{Euclid \emph{Elem}.\ 3.20 states that if \m{BC} is  joined to the center \m{O} of the circle, then \m{\angle BOC = 2\cdot\angle A},  and \m{\angle BOC} is equal to \m{BC\kern-1em\raise1.8ex\hbox{\frown}}.} 

 

\stoptext