Besok pagi di kumpulin

x = a + 20

180 = x + 40 + 70
180 = x + 110
x = 70°

70 = a + 20
a = 50°

180 = 20 + 40 + c
60 + c = 180
c = 120°

180 = 70 + a + b
180 = 70 + 50 + b
120 + b = 180
b = 60°

soalnya kalo ∆ Sama Kaki Sudut kaki nya sama