Question

plzz show full method plz....​

Answer 1

Step-by-step explanation:

60°+80°+x°=180° because sum of all the interior angle of a triangle is 180°

value of x will be 40°

Now to find exterior angle

lets consider exterior angle as a b and c

60°+a=180° by linear pair

a=120°

80°+b=180° by linear pair

b=100°

40°+c=180° by linear pair

c=140°

Answer 2

Answer:

the exterior angle of a triangle is equal to the sum of the opposite interior angle

Step-by-step explanation:

let the exterir angle be x,

60 +80 =x

140 =x

the measure of the exterior angle is 140