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A draftsman must construct quadrilateral ABCD with AB = 5 cm, BC = 6 cm, CD = 4 cm, DA = 5 cm and diagonal BD = 7 cm.
Which triangle should he draw FIRST so that two of its sides plus the given diagonal are all known?

Class 8Constructing QuadrilateralsGeometry
  • Atriangle ABD
  • Btriangle ABC
  • Ctriangle BCA
  • Dtriangle ACD

Step-by-Step Solution

Diagonal BD is given. Triangle ABD has sides AB = 5, DA = 5 and the diagonal BD = 7 — all three lengths known, so it is drawn first.
Answer: A) triangle ABD

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