Question

Find the unknown angles in the following figures : ​

Answer 1

Answer:

40° + y =115° (exterior angle property)

y=115-40

y=75°

40 +75+x=180

x=180-115

x=65°

Answer 2

Answer:

exterior angle = 115

as we exterior angel = sum of two angle

a+b = 115

40 + b =115

b = 115 - 40 = 75

angle a = 75 degree

as we know sum of all angle of triangle is 180 so

a + b+c = 180

75 + 40 + c = 180

115 + c = 180

c = 180 - 115

c =65