12. A diagonal of a quadrilateral is 40 cm long and the pre pendicular to it opposite corner are 8 and 10 respectively (fig .11.15)
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diagonal (d) of the quadrilateral = 40cm
the two perpendicular be p1 and p2
then, p1=8cm and p2=10cm
Area of a quadrilateral = d/2(p1 + p2)
= 40/2(8+10)
= 20(18)= 20×18
= 360 sq.cm
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