When we possess ourselves with the utmost security of the demonstration, that the three angles of a triangle are equal to two right ones, what do we more but perceive, that equality to two right ones does necessarily agree to, and is inseparable from, the three angles of a triangle?
Frogapenak ematen duen ziurtasunik handienaz jabetzen garenean triangelu baten hiru angeluek bi angelu zuzen osatzen dutela, zer besterik egiten dugu bi zuzenekiko berdintasuna triangelu baten hiru angeluekin nahitaez datorrela ados eta haietatik bereiztezina dela hauteman baino?