in the given figure,AB||CD,angleA =90°and angleAEC=40° .find angle ECD
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Step-by-step explanation:∠FEB=∠AFE+∠FAE −−(Sum of interior angle of a ∆ is equal to its exterior angle)⇒∠FEB=40°+90° ⇒∠FEB=130°Now, ∠FEB=∠ECD=130° −−(corresponding angles as AB∥CD)
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