No 22
180 = (180-70)+(180-50)+(180-X)
180 = 110 + 30 + 180 - X
180 - 110 - 30 - 180 = -X
-140 = -X
X = 140
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No 22
180 = (180-70)+(180-50)+(180-X)
180 = 110 + 30 + 180 - X
180 - 110 - 30 - 180 = -X
-140 = -X
X = 140
140° = 10x
14° = x
A = 40°
B = 40°
C = 100°
Ini merupakan segitiga lancip sama kaki (c)
Maaf jika salah