find the value of x in the chapter triangles
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i) /_B = /_C [ As the adjacent angles of equal sides are equal]
x = 40°
ii) /_ABC = /_ACB [ As the adjacent angles of equal sides are equal]
/_ACB + /_ ACD = 180° [Sum of interior and exterior angle is supplementary or 180°]
/_ACB + 120° = 180°
/_ ACB = 180°-120°
/_ACB = 60°
x = 60°
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