tolong dijawab beserta caranya, thx.

1. x = 180* - (180*- 100*)- 30*
x = 180* - 80* - 30*
x = 70*

y = 180* - (180*- 110*) - 48*
y = 180* - 70* - 48*
y = 62*

180* - (180*-136*) - (180*-108*)
= 180* - 44* - 72*
= 64*

z = 180* - 64* = 116*

2. a = 180* - 80* - 50* = 50*
b = 180* - 50* = 130*
c = a = 50* (sudut bertolak belakang)
d = 180* - 80* = 100*
e = 180* - 50* = 130*

catatan : * artinya derajat