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An extended arch is called a vault. Most tunnel are built using vaults. It's a bunch of arches put together.

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15y ago

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When an arch is extended overhead into a half cylinder it is known as?

barrel vault


When an arch is extended overhead into a half cylinder it is known as a?

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What is the center of an arch called?

crown


What is curved support called?

An arch


What is the keystone of an arch called?

coigne