tolong caranya dong, keduanya ya please

Gambar 1

a + 140 = 180
a. = 180 - 140
a. = 40

b + 60 + 40 = 180
b. = 180 - 60 + 40
b. = 180 - 100
b. = 80

c = a + 60
= 40 + 60
= 100

Gambar 2

a = 50° (sehadap)

b + 50 + 60 = 180
b + 110. = 180
b. = 180 - 110
b. = 70

c = 60° (dalam bersebrangan)