Question

please answer question ​

Answer 1

Answer:

40°

Step-by-step explanation:

∡ ADC = 110°

∡ ADC = ∡ABC                 [ Opposite angles of a parallelogram ]

∴ ∡ ABC = 110°

∡ ABC + ∡ CBE = 180°        [Linear Pair]

110° + ∡ CBE = 180°

∡ CBE = 180° - 110°

∡ CBE = 70°

∡ CBE = ∡CEB = 70°                  [CB = CE as BEC is isosceles]

∡ CBE + ∡CEB + ∡ECB = 180°      [Angle sum property of triangle]

70° + 70° + ∡ECB = 180°

∡ECB = 180° - 140°

∡ECB = 40°

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