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In a trapezium ABCD, AB and DC are parallel sides and ∠ ADC = 90°. If AB = 15 cm, CD = 40 cm and diagonal AC = 41 cm. Then the area of the trapezium ABCD is

245 cm2
240 cm2
247.5 cm2
250 cm2

Correct Answer: 247.5 cm2

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