Question 948802
1.{{{A+S=180}}}
2.{{{A+C=90}}}
3.{{{S+C=202}}}
Subtract eq. 2 from eq. 1,
{{{A+S-A-C=180-90}}}
{{{S-C=90}}}
Now add this equation and eq. 3,
{{{S+C+S-C=202+90}}}
{{{2S=292}}}
{{{S=146}}}
{{{A+146=180}}}
{{{A=34}}}