The dimensions of a right triangle are shown in the diagram.

A right triangle with a hypotenuse of 20.7 c-m , height of 7.8 c-m and base is of x c-m.

What is the length of the missing side, to the nearest tenth of a centimeter?

A
12.9 cm

B
14.25 cm

C
19.2 cm

D
22.1 cm