If three lines are equal the two which form the base, and the perpendicular from the centre-the conclusion is evident at a glance to one who knows the former proposition. Obviously, therefore, the potentially existing constructions are discovered by being brought to actuality;
Hiru lerro berdin marraztuz gero-bi oinarrian eta erdigunetik perpendikularra den lerro zuzena-ikusten ari denarentzat agerikoa izango delako, hura ezagutzen badu.