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The length of the two parallel sides of a right trapezoid are 6 cm and 8 cm, respectively top and bottom bases, and the altitude is 4 cm. The distance between the intersection of the two straight lines that contain the non-parallel legs and the midpoint of the major base is:

a)

$\,5\sqrt{15}\,$ cm

b)

$\,2\sqrt{19}\,$ cm

c)

$\,3\sqrt{21}\,$ cm

d)

$\,4\sqrt{17}\,$ cm

e)

none of these