Question 1090476
{{{A+B=90}}}
{{{B+C=90}}}
{{{A+C=90}}}
So,
{{{A+B=B+C}}}
{{{A=C}}}
.
.
.
{{{A+B=A+C}}}
{{{B=C}}}
.
.
.
{{{B+C=A+C}}}
{{{A=B}}}
.
.
.
So,
{{{A=B=C}}}