Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: how wide is the glass dome?
Document: A beautiful cake dome made of high quality and heavy glass. The ribbed design adds to its simplistic elegance, and makes it stand out from all other plain glass cake domes. The dome is 10" in diameter, outside dimensions. So it may not fit your 10" dia cake.
Anytime you order something made out of glass online, until it is in your posession, you worry about what shape it will be in when it arrives. Glad to report that this cake stand with ribbed dome was in perfect shape upon receipt. Both pieces are of a very heavy and sturdy glass. Will be used for years to come. I am very pleased with the purchase. Highly recommended.
Anchor Hocking is an old and trusted glassware manufacturer that has been around for over 100 years. This delightful cake set is an attractive kitchen item for displaying and storing your cake. On mine, the dome seats well on the platter, though as you might expect with glass-on-glass, it's not perfect.The best thing about this set is how nice it looks on a table, with its cake, amongst other treats and comestibles.
First it came in perfect shape ,Great product..All Glass .........Love it..........
Very nice for the money. Its glass only fear is the top just its on op no catch or cradle to ensure it doesn't slide off
The glass is nice and thick and heavy. My mom has wanted one for a long time and she proudly displays this on her counter all the time. This won't break with light misuse, perfect for sneaky grandkids. :)
After buying a plastic cake plate and having it crack on me, I decided to stick with glass. This set is really nice - it is heavy because it is glass, however it works well and looks great!
It's beautiful and was very well packaged! I can't wait for its endless uses :) I thought the whole lid had the ribbed effect but it's only the sides of the glass. It looks more beautiful in person. Perfect!
I bought this product in February and it is still holding strong. It has a very nice design and the glass is heavy(which is a good sign of durability). The price is a little higher now but it is still worth the investment.
Made in the USA. That's good enough for me. Heavy pieces of glass. Definitely not the shatters-if-you-look-at-it-sideways imported junk glass that's nearly impossible to avoid without paying through the nose. Love it.
Answer: I believe the dome is between 10 and 11 inches.... I am going from memory as my dome cracked in transport during a move and I no longer have the dome.... I do remember placing a 9 inch round double stacked cake on the plate an the dome cleared the top with room to spare and the sides had about 1-2 inches of clearance, that is where I am getting my guess-timation.  I hope this was if some assistance.