Question 363234
Yes and yes.
{{{A+S=180}}}
{{{A+C=90}}}
If you subtract them, then
{{{S-C=90}}}
So,
If you know {{{C}}}, you can find {{{S}}} and {{{A}}}. 
If you know {{{S}}}, you can find {{{C}}} and {{{A}}}.
If you know {{{A}}}, you can find {{{C}}} and {{{S}}}.