Name That Greek Mathematician

I love some good hard work. My good friend Michael called me last week and asked me if I might help him on a job he was going to be doing in his back yard. He is going to be building a workshop for himself. He has started by digging what is called a footer, like the foot of a building. Now, he and I are working to build forms, like a mold, so that we can pour the concrete walls. Those of you who were in Further with Numbers had better know the name of that mathematician...

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