Quantitative Aptitude Mensuration Plane Figures

In ΔABC, D, E and F are the midpoints of sides AB, BC and CA, respectively. If AB = 12 cm, BC = 20 cm and CA = 15 cm, then the value of \(\frac{1}{2}\left( {DE + EF + DF} \right)\) is:

1
23.5 cm
2
5.88 cm 
3
15.67 cm
4
11.75 cm

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