Saturday, March 21, 2020

Dynamic Geometry Problem 1464: Quadrilateral, Interior Point, Midpoint of Sides, Equal Sum of Areas

Interactive step-by-step animation using GeoGebra. Post your solution in the comment box below.
Level: Mathematics Education, High School, Honors Geometry, College.

Details: Click on the figure below.

Dynamic Geometry Problem 1464: Quadrilateral, Interior Point, Midpoint of Sides, Equal Sum of Areas, Step-by-step Illustration, iPad.

Posted by Antonio Gutierrez at 5:34 PM
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6 comments:

  1. Sumith PeirisMarch 22, 2020 at 12:52 AM

    From the midpoint theorem,
    EF//AC//GH and FG//BD//EH so EFGH is a parallelogram and by Problem 1463,

    S(PEF) + S(PGH) = S(PFG) + S(PEH) ....(1)

    Now S(ABCD) = S(ABC) + S(ACD) = 4.S(BEF) + 4.S(DGH) ...(2)

    Similary S(ABCD) = S(ABD) + S(BCD) = 4.S(AEH) + 4.S(CFG) ....(3)

    From (2) & (3), S(BEF) + S(DGH) = S(CFG) + S(AEH) ...(4)

    Add (1) + (4)

    S2 + S4 = S3 + S1

    Sumith Peiris
    Moratuwa
    Sri Lanka

    ReplyDelete
  2. c.t.e.oMarch 22, 2020 at 2:33 PM

    APE(=PEB+)+APH(=PHD+)+CPG(=GPD+)+CPF(=FPB+)
    => S yellow(=S green)

    ReplyDelete
  3. c.t.e.oMarch 23, 2020 at 2:18 PM

    P1465
    AE=AH, BE=BF, CG=FC, DG=DH => AE+BE+CG+DG=AH+BF+FC+DH =>
    (AE+BE+CG+DG).R =(AH+BF+FC+DH).R
    S yellow = S green

    ReplyDelete

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