What has been affirmed without proof can also be denied without proof.
Father of geometry
Widely attributed, but a direct primary source from Euclid's time is elusive.
c. 300 BCE (attributed much later)
Found in 2 providers: gemini,deepseek
Cross Reference
2 sources
"If a straight line touch a circle, and from the point of contact there be drawn across in the circle a straight line cutting the circle, the angles which it makes with the tangent will be equal to the…"
Strange & Unusual"In any triangle, if one of the sides be produced, the exterior angle is equal to the two interior and opposite angles, and the three interior angles of the triangle are equal to two right angles."
Strange & Unusual"Further, of trilateral figures, a right-angled triangle is that which has a right angle, an obtuse-angled triangle that which has an obtuse angle, and an acute-angled triangle that which has its three…"
Strange & Unusual"The square on the side subtending the right angle in right-angled triangles is equal to the squares on the sides containing the right angle."
Shocking"And the whole is greater than the part."
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