Euclid:Proposition/IV/15/Porism
Jump to navigation
Jump to search
Proposition
In the words of Euclid:
- From this it is manifest that the side of the hexagon is equal to the radius of the circle.
And, in like manner as in the case of the pentagon, if through the points of division on the circle we draw tangents to the circle, there will be circumscribed about the circle an equilateral and equiangular hexagon in conformity with what was explained in the case of the pentagon.
And further by means to those explained in the case of the pentagon we can both inscribe a circle in a given hexagon and circumscribe one about it.
(The Elements: Book $\text{IV}$: Proposition $15$ : Porism)
Sources
- 1926: Sir Thomas L. Heath: Euclid: The Thirteen Books of The Elements: Volume 2 (2nd ed.) ... (previous) ... (next): Book $\text{IV}$. Propositions