Question 427392

the two supplementary angles add up to 180°

if one of them is {{{alpha}}} and the other one is {{{beta}}}, then we have

{{{alpha + beta = 180}}}........if {{{alpha= 2beta}}}, then

{{{2beta + beta = 180}}}

{{{3beta  = 180}}}

{{{beta  = 180/3}}}

{{{beta  = 60}}}

{{{alpha= 2*60}}}

{{{alpha= 120}}}

so, your angles are: {{{alpha= 120}}} and {{{beta  = 60}}}