find the value of x in each of the given triangles
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1. 50 degree
2. 20 degree
3. 52 degree.
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a) the sum of all angles of any triangle is 180° according to the angle-sum property.
so,
60°+70°+ x=180°
130°+x=180°
x=180°-130°
x=50°
b) 105°+55°+x=180°
160°+x=180°
x=180°-160°
x=20°
c) 38°+90°+x=180°
128°+x=180°
x=180°-128°
x=52°
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