Most recent change of ConstructingAPentagon

Edit made on October 23, 2009 by ColinWright at 13:38:31

Deleted text in red / Inserted text in green

WW
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[[[>70 IMG:pentagon3.png ]]]

METHOD 1
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!! Method 1

* Draw circle centre A

* Draw perpendicular diameters BC and DE

* Construct midpoint of AD - label F

* Construct midpoint of AD
** label F
* Construct line BF

* Construct bisector of angle AFB

* Label G - the intersection of bisector and AB

* Draw parallel to CD through G

* Label H intersection of parallel with circle
[[[>70 IMG:pentagon4.png ]]]
* BH is one side of pentagon - complete pentagon
* BH is one side of pentagon
** complete pentagon
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[[[ IMG:pentagon3.png ]]]
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METHOD 2
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!! Method 2

* Draw circle centre O, radius OA

* Construct 2 radii perpendicular to OA - label OB and OC

* Construct 2 radii perpendicular to OA
** label OB and OC
* Construct D, the midpoint of OB

* Draw circle, centre D, radius DA - label E, the intersection with OC

* Draw circle, centre A, radius AE - label F and G, the intersection with the original circle

* AF and AG are two sides of the pentagon - complete pentagon
* Draw circle, centre D, radius DA
** label E, the intersection with OC
* Draw circle, centre A, radius AE
** label F and G, the intersection with the original circle
* AF and AG are two sides of the pentagon
** complete pentagon
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[[[ IMG:pentagon4.png ]]]
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