Question

I don't understand how to do this can someone help me with this problem? My mid-term is tomorrow and I want one less problem to get wrong. Thank you !​

Answer 1

∆ on the Left;

x + 95 + 35 = 180°

x + 130 = 180°
x = 50°

In the middle:

50° + 63° + x= 180°

113° + x = 180°

x = 67°

∆ on the right:

67° + 85° + x = 180°

152 + x = 180°
x = 28°