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Galaxy type arranged by size?
That's a bit tricky. Each type of galaxy has a wide range of sizes, so you can't say, for example, that any elliptical galaxy is larger than any spiral galaxy - because they aren't - though I believe that elliptical galaxies do have a general tendency to be larger than the other types.
Can diameter be measured in feet?
Yes. Although if you are measuring the diameter of an atom, or a galaxy, you might consider other units to be far more suitable.
What galaxy has an oval shape?
Elliptical galaxies have an oval shape. An example is the Messier 87.
What is the example of elliptical energy?
The cart is before the horse. Before an example can be cited, we need a definition of elliptical energy. Come back when you have that.
How do you find a circumference?
Circumference of a circle is pi * diameter. Diameter is 2 * radius. So if you know the radius, circumference is 2 * pi * radius. Now choose an appropriate approximation for pi (3.14, or 3.1416, or even the fraction 22/7), depending on your application. This will work for ANY circle, no matter how big or small it is, as long as it's a true circle and not a different elliptical shape, e.g. an oval.
