find the area of a plot which is in shape of a quadrilateral, one of whose diagonals is 20m and lengths of perpendicular from the opposite corners on it are of lengths 12m & 18m respectively.
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Area of quadrilateral = ¹/2 ×(one diagonal) × (Sum of the lengths of the perpendiculars drawn from it on the remaining two vertices)
= ¹/2 ×20×(12+18)
= 10 × 30 =300 m²
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