This figure is a cylinder. We can use the formula for the surface area [tex]A= 2 \pi r h + 2 \pi r x^{2} [/tex]. Since the radius is the half of the diameter, we can write that r=4.3mm. Setting [tex] \pi = 3.14 [/tex], we can calculate the height. [tex]2*3.14*h (h+4.3) =651.13[/tex]. Solving this quadratic equation we find two roots and one them is positive, which is the answer and it is approximately 8.257 mm
