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प्रश्न
Find the area of a quadrilateral one of whose diagonals is 30 cm long and the perpendiculars from the other two vertices are 19 cm and 11 cm respectively.
योग
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उत्तर
Area = `1/2` × one diagonal × sum of the length of the perpendicular drawn from it on the remaining two vertices.
= `1/2 xx 30 xx ( 11 + 19 )`
= 450 sq.cm
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