fulcrums in Roman architecture?

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Does anyone know anything about Roman architecture and how a triangular fulcrum might apply to it? I think a colleague or two of mine mentioned that a triangle was a keystone used in either arches or aqueducts which I think I remember learning in my art history class, but I'm not sure. I cannot find anything on this peculiarity online that will help me develop my cross-curricular project more. Please help if you can. Thank you.

The top central stone in a Roman arch is the keystone; cut like a triangle, with the point cut off, narrow end down. The arches were first built over a wooden form; the keystone was inserted to lock the arch, so to speak, and after it's in place the form can be removed.

Each structural stone in the arch was cut with a slight taper to establish the arch-curve.

HTH, John