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5)
a)
B^=60°;C^=40°
X+40+60=180
X=180-100
X=80°
6)
∆ABC
Y+75+45=180
Y=180-120
Y=60°
∆CDE
X+45+60=180
X=180-105
X=75°
7)
a)
X+80=180
X=180-80
X=100°
b)
X+70=180
X=180-70
X=110°
a)
B^=60°;C^=40°
X+40+60=180
X=180-100
X=80°
6)
∆ABC
Y+75+45=180
Y=180-120
Y=60°
∆CDE
X+45+60=180
X=180-105
X=75°
7)
a)
X+80=180
X=180-80
X=100°
b)
X+70=180
X=180-70
X=110°
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