Question 965632
I'll assume y is opposite of angle theta and x is adjacent to it.
{{{y/x=3}}}
{{{y=3x}}}
{{{x^2+y^2=25}}}
{{{x^2+9x^2=25}}}
{{{10x^2=25}}}
{{{x^2=25/10}}}
{{{x^2=5/2}}}
{{{x=(5/2)sqrt(2)}}}
{{{y=(15/2)sqrt(2)}}}