I want to draw 3 cylinders in the SAME PLANE having the dimensions specified : cyl.1-->radii-1.8cm , height-12 cm , cyl.2 and cyl.3-->radii-1.22 , height-4.76 cm

They have to be drawn such that it looks like Parent(cyl.1) and Daughter arteries(cyl.2 and 3). How do I draw it such that I can mesh the resulting geometry by hexahedral meshing.

if you have gambit tutirial guide, try tutorial on "three pipe junction", I hope you will get further ideas how to make relevant changes to obtain the geometry as you require it to be!

I have done the 3 pipe intersection but my problem is that all the 3 pipes are in same plane unlike in the tutorial problem.So how do I make separate volumes after uniting them by the sphere.