pentagon

  1. K

    a hard pentagon questionABCDE

    ABCDE is a regular pentagon.CF is perpendicular to AB. KL is perpendicular to AC. |FB|=|KL|.|DE|=6 units. Find area of triangle AKC? https://postimg.org/image/8yw954k9z/ Question and image are very clear. I don't want any solution with trigonometry and golden ratio. I don't want to hear any...
  2. K

    pentagon help needed

    ABCDE is a regular pentagon.[BE] and [BD] are diagonals.BF is internal angle bisector.CK is perpendicular to BD. |CK|=1.Find |BF|.
  3. D

    Pentagon symmetries

    Hey, ive done the whole question except for this last part. https://gyazo.com/696217126c2d5ecd2fb621d4ea0296de i.e, found symmetries rotation and reflection, wrote them as functions and done the cayley table. Now im confused exactly what this question is asking ? Is it asking to show that g...
  4. K

    pentagon help

    View image: analitik 001
  5. K

    pentagon adventure

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  6. K

    puzzle of pentagon

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  7. K

    an unsolved pentagon

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  8. K

    hard pentagon

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  9. K

    pentagon

    View image: analitik
  10. A

    Deriving the Angles of a Pentagon

    Deriving the Angles of a Pentagon - Robotic Arm Application Hello, I am working on a robotic arm with 4 jointed parts that have a certain length. The problem is that if a user specifies a certain location in space, what angle should each of the jointed parts move to - essentially deriving...
  11. R

    Pentagon Circumscribed about a circle?

    It says solve for x if RS=10, ST=13, TU=11. UV=12, and VR=12. I cannot for the life of me figure this out. I added a picture for help. Thanks a bunch if anyone can help!
  12. V

    convex pentagon area

  13. F

    Golden ratio pentagon

    So I need to show that the diagonal x satisfies the following ratio x/1=1/(x-1). I know this turns out to be the golden ratio, But I cant seem to find the similar triangles in order to find this ratio in this pentagon. Any help is appreciated, thanks
  14. Nadeshiko

    Diagonals in a regular pentagon

    How many diagonals does a regular pentagon have? Please help me on this problem! I would appreciate steps on how to get the answer or hints!
  15. T

    Pentagon Problem

    Pentagon ABCDE BC = CD = BD = AE Perimeter (ABCDE) = 10 Find the sides of rectangle, for which the area of the pentagon will be maximum. Please help! i need it so much (sry for my english)
  16. S

    Pentagon.

    a || b Construct a 4 angled figure ( could be Square, trapezoid, deltoid or whatever ) whose Surface will be equal to the surface of the pentagon.
  17. Veronica1999

    pentagon

    Let A=(0,0), B=(7,2), C=(3,4), D=(3,7) and E=(-1,5). Cameron walks the polygonal path ABCDEA, writing down the number of degrees turned at each corner. What is the sum of these five numbers? Notice that ABCDE in not a convex pentagon. I got 491.(using a protractor) Could someone take a look...
  18. J

    angles in pentagons

    hey! 1. this diagram (the one attached) shows a regular pentagon divided into a quadrilateral. calcualte the angles in each of these triangles and the quadrilateral. thnx a bunch Joyousness
  19. J

    triangles from pentagons

    Hi. XD 1. a regular pentagon is divided into three triangles. calculate all the angles in each of the triangles.[/B] (a picture of the pentagon described above is attached). please explain too. (the following info is relevant for the next 2 questions. btw the info the image of the...
  20. G

    Pentagon problem

    How can you show that a regular pentagon can be divided into 2010 triangles so that one is type A and 2009 are type B? The middle triangle is type A. The sides triangles are type B. Thank you!