It is a cylinder with a radius of 4 units and a height of 3 units.
If my understanding is correct, you need to combine these shapes in a form that satisfies all the statements below?
Seeing as you have choosen cylinder as the shape I see only one good combination that will create a good cylinder shape.
First the two circles have a radius of 4 each and no height. This is perfect for the top and bottum of our cylinder. To add height we use the recangle with the dimensions 3 and
Before we mix them together, note that a circles circumference is given by
Now you can see, the rectangle has the perfect dimensions. The side that is
Therefore our shape is a cylinder, with the radius 4 units and the height of 3 units :)