Q. Where is the keystone of an arch being placed?
Solution:
A keystone (also known as capstone) is the wedge-shaped stone piece at the apex of a masonry arch, or the generally round one at the apex of a vault. The curve at the top of the arch is known as the crown.
The point at which the curve begins is the springing or spring-line.
The curve between the springing and the crown is known as the haunch.
The inner curve of the arch is the intrados.
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