All sides of a quadrilateral ABCD touch a circle. If AB = 6 cm, BC = 7.5 cm, CD = 3 cm. then DA is

All sides of a quadrilateral ABCD touch a circle. If AB = 6 cm, BC = 7.5 cm, CD = 3 cm. then DA is
1). 3.5 cm
2). 4.5 cm
3). 2.5 cm
4). 1.5 cm

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