Question

Помогите решить пожалуйста

Answer 1

$adc = 180 ^{0} \\ dc = 100 ^{0} \\ bc = 140 ^{0} \\ ab = 40 ^{0}\\ \\ < a = \frac{140 ^{0} + 100 ^{0}}{2} = 120 ^{0}\\ < a + < c = 180 ^{0}\\ < c = 60 ^{0} \\ < b = 90 ^{0} \\ < d = 90^{0}$