Question

the two interior opposite angle of an exterior angle of a triangle are 60degree and 80degree find the measure of exterior angle

Answer 1

sum of two Angles are sum of exterior angle....
so...
80+60= 140...

thus 140° is the exterior angle

Answer 2

Answer:

$\red { Exterior \:angle }\green {= 140\degree }$

Step-by-step explanation:

$In \:\triangle ABC ,$

$BC \:is\: extended \: to \:D$

$Interior \:angle \: at \: C \\= Sum \:of \: interior \: opposite \: angles$

$\implies \angle ACD = \angle A + \angle B$

$= 80\degree + 60\degree$

$= 140°$

Therefore.,

$\red { Exterior \:angle }\green {= 140\degree }$

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