Well, there are lots of different types of starfish and that means that they can't all be the same size. :)
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Height = half(width) = 5 cm. So, assuming the objject is a cuboid, its volume is Width*Length*Height = 10cm*20cm*5cm = 10*20*5 cm3 = 1000 cm3
All you need to do is times width by length by height 2x5x3 = 30cm^3
length times width times height = volume 10cm ( 3cm ) ( 5cm ) = 150 cubic cm
There are 2.54 cm/inch; so to convert cm to inches, divide by 2.54. It is the same whether the measurement is length, width, or height.
Width = 110 cm Length = 121 cm Height = 1.0909 cm