Question

Placed at the highest point of an arch, the _____ locks the stones of the arch into place.

A. capital
B. vault
C. keystone
D. flagstone

Answer 1

C. keystone

Step-by-step explanation:

You want to know the name of the stone at the top of an arch that locks the stones in place.

Keystone

The wedge-shaped stone at the top of an arch is called the "keystone." Its shape and position make the arch self-supporting by locking the other stones in place.

A capital is a flat stone at the top of a pillar. A flagstone is used to construct a path or walkway. A vault is the empty space below an arched roof.