Question 1064608
Angles at C and at F are corresponding parts, so since congruent, 
measures are equal.
{{{3x-40=2x-10}}}
{{{x-40=-10}}}
{{{x=40-10}}}
{{{x=30}}}


Measure of angle at C
{{{3x-40}}}
{{{3*30-40}}}
{{{90-40}}}
{{{highlight(50)}}}