Question 1133689

a triangle has three angles and their sum is {{{180}}}°

if one is {{{65}}}, {{{35 }}}and {{{2 (x-10)}}}, we have

{{{65+35 +2 (x-10)=180}}}.........solve for {{{x}}}

{{{100+2x-20=180}}}

{{{80+2x=180}}}

{{{2x=180-80}}}

{{{2x=100}}}

{{{x=50}}}=> now find the third angle

{{{2 (x-10)}}}..substitute {{{x}}}

{{{2 (50-10)}}}

{{{2 (40)}}}

{{{80}}}°->the third angle

check the sum:

{{{65+35 +80=180}}}
{{{180=180}}}