Maths-
General
Easy

Question

Prove that AB ≅ DC

hintHint:

Use angle sum property.

The correct answer is: AB = DC (corresponding parts of congruent triangles)


    Complete step by step solution:
    Consider 2 triangles, △ AEB and △ CED
    From the figure, we have
    AE = CE (given)
    ∠ ABE = ∠ CDE = 55° (alternate angles)
    ⇒ AB ∥ CD
    So, we have ∠EAB=∠ECD=65° (alternate angles, since )
    Now, ∠ CED = 180°- (65° + 55°) =180° - 120° = 60° (angle sum property)
    ∠ CED = ∠ AEB = 60° (vertically opposite angles)
    In △ AEB and △ CED,
    ∠ EAB=∠ECD=65°(alternate angles)
    AE = CE (given)
    ∠ CED = ∠ AEB = 60° (vertically opposite angles)
    So, △ AEB ⩭ △ CED by ASA congruence criterion
    ⇒ AB = DC (corresponding parts of congruent triangles)

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