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Mathematics

A quadrilateral ABCD is a trapezium if

  1. AB = DC

  2. AD = BC

  3. ∠A + ∠C = 180°

  4. ∠B + ∠C = 180°

Rectilinear Figures

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Answer

In a trapezium the sum of co-interior adjacent angles = 180°.

From figure,

A quadrilateral ABCD is a trapezium if? Rectilinear Figures, ML Aggarwal Understanding Mathematics Solutions ICSE Class 9.

∠B and ∠C are adjacent angles.

∴ ∠B + ∠C = 180°

Hence, Option 4 is the correct option.

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