Regular Pentagon Constructed with  Compasses Alone




G. R. Livingston, L. S. Shively, American Mathematical Monthly, Vol. 43, No. 6. (Jun. - Jul., 1936), pp. 380-381.
Even though Georg Mohr and Lorenzo Mascheroni knew nothing about Cabri, we may still call this sort of construction the Mohr-Mascheroni construction of dynamic geometry.