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Question

Find the area of the given quadrilateral ABCD. Given that the length of BD, AE and BC are 28 cm, 20 cm, and 8 cm respectively.

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Solution

It is given that DB = 28 cm, AE = 20 cm and BC = 8 cm
AE and BC are perpendicular to diagonal BD
Area of quadrilateral ABCD = Area of Δ ABD + Area of Δ BDC
= 12 × DB × AE + 12 × DB × BC
= 12 × DB × (AE + BC)
= 12 × 28 × (20 + 8)

=14 × 28
= 392 cm2


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