find the area of the trapezium
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the area of trapezium = 1/2×( l+ b) × h
=1/2 ×(25+11)×21=378 cm²
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Area of trapezium = 1/2(length + breadth)*height
=> 1/2(11 + 25)*21
=> 1/2 * 36 * 21
=> 18 * 21 = 378cm^2 (Answer)
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