A trapezium of area 55 cm2 can be divided into a rectangle and two equal triangles. If the parallel sides of the trapezium are of 15 cm and 7 cm, find the area of the triangle.

A trapezium of area 55 cm² can be divided into a rectangle and two equal triangles. If the parallel sides of the trapezium are of 15 cm and 7 cm, find the area of the triangle.
1). 10 cm²
2). 20 cm²
3). 25 cm²
4). 35 cm²

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