The work referred to by De Morgan is the Quadratura circuli tandem inventa & clarissime demonstrata .
And here are the words, on the independent testimonies of Clavius and Kastner: "Ambitus dodecagoni circulo inscribendi plus potest quam circuli ambitus.
The full title has some interest: Vera circuli et hyperbolae quadratura cui accedit geometriae pars universalis inserviens quantitatum curvarum transmutationi et mensurae.
In a number of specimens annuli can be observed and circuli counted.
By counting the number of circuli between the last annulus and the edge of the scale, it should be possible to determine the approximate time of death of a fossil fish.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "circuli" in a variety of sentences. We hope that you will now be able to make sentences using this word.
