Question 339185
1.{{{C+A=90}}}
2.{{{S+A=180}}}
3.{{{C=(S/3)-2}}}
Subtract eq. 1 from eq. 2,
{{{S+A-C-A=180-90}}}
{{{S-C=90}}}
Substitute eq. 3.
{{{S-(S/3)+2=90}}}
{{{(2/3)S=88}}}
{{{S=88(3/2)}}}
{{{S=132}}}degrees
.
.
.
{{{132+A=180}}}
{{{highlight(A=48)}}}degrees