The lengths of two parallel sides of a trapezium are 21 cm and 9 cm. If its height is 10 cm, then what is the area (in sq. cm) of the trapezium?

The lengths of two parallel sides of a trapezium are 21 cm and 9 cm. If its height is 10 cm, then what is the area (in sq. cm) of the trapezium?
1). 35
2). 75
3). 150
4). 225

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