The sides of a triangle are 5 cm, 12 cm and 13 cm. The area (in $$cm^{2}$$) of the triangle formed by joining the mid-points of the sides of the triangle is:

A

7.5 $$cm^{2}$$

B

21.5 $$cm^{2}$$

C

15 $$cm^{2}$$

D

30 $$cm^{2}$$