Friday, February 13, 2015

Geometry Problem 1082: Square, Circle, Center, Radius, Side, Isosceles Triangle, 90 Degrees, Area

Geometry Problem. Post your solution in the comment box below.
Level: Mathematics Education, High School, Honors Geometry, College.

Click the diagram below to enlarge it.

Online Math: Geometry Problem 1082: Square, Circle, Center, Radius, Side, Isosceles Triangle, 90 Degrees, Area.

1 comment:

  1. http://s15.postimg.org/vfo5l4wgr/Pro_1082.png

    1. In triangle BFD with median FO we have
    BF^2+FD^2=2(BO^2+FO^2)
    replace BF= a/sqrt(2), FD= a, BO= a/sqrt(2) in above
    we get FO= a/2
    Circles centered A ,B, C and D have symmetry axis Ox so OE=OF’
    Circles centered B and D have symmetry axis BD so OF=OF’ => OE=OF= a/2
    2. Due to symmetric property as shown above we have triangles OFC congruent to OF’A and OEB ( case ASA)
    Triangle OEB is the image of OFC in the rotational transformation centered O , rotational angle = 90
    so angle ( EOF)=90
    3. Area S1= ½. a/2 . a/2= a^2/8= S/8

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