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Difficulty: 4 of 5 Latest: LOP (in Geometry)

  
Let B and C be two fixed points on a circle with a center O
such that the points B, C, and O are not collinear. Let A be
a variable point on the same circle (distinct from points B
and C and the perpendicular bisector of BC). Let E and F
be the midpoints of BC and AO respectively. Let ray AE
intersect the circle again at point D. Let lines DO and EF
intersect at point P.

What is the locus of point P as point A moves around the
circle?
  
(No Solution Yet, 3 Comments) Submitted on 2017-12-13 by Bractals   
Difficulty: 4 of 5 Bonus: FIGURE it out ! (in General) Rating: 3.33
  1. With an unlimited supply of toothpicks of n different colors, how many different triangles can be formed on a flat surface, using three toothpicks for the sides of each triangle?
    (Reflections are considered different, but rotations are not.)

  2. How many different squares?

(No Solution Yet, 12 Comments) Submitted on 2004-09-10 by SilverKnight   
Difficulty: 3 of 5Perform and explain (in Tricks)
Posted on 2017-12-12 by Ady TZIDON (No Solution Yet, 11 Comments)
Difficulty: 2 of 5Enigma (in Logic)
Posted on 2017-12-11 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 4 of 5Verify and prove (in Sequences)
Posted on 2017-12-10 by Ady TZIDON (No Solution Yet, 5 Comments)
Difficulty: 4 of 5All, except two (in Sequences)
Posted on 2017-12-09 by Ady TZIDON (No Solution Yet, 4 Comments)
Difficulty: 3 of 5Spelling bee results (in Just Math) Rating: 2.00
Posted on 2017-12-08 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 4 of 5A creative contest (in Word Problems)
Posted on 2017-12-07 by Ady TZIDON (No Solution Yet, 0 Comments)
Difficulty: 3 of 5Three fours (in Numbers)
Posted on 2017-12-06 by Ady TZIDON (No Solution Yet, 3 Comments)
Difficulty: 3 of 5Just name the date (in General)
Posted on 2017-12-05 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 3 of 5No miracles (in Famous Riddles)
Posted on 2017-12-04 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Just 4 different digits (in Numbers)
Posted on 2017-12-03 by Ady TZIDON (No Solution Yet, 10 Comments)
Difficulty: 4 of 5One ninth of a pandigital (in Numbers)
Posted on 2017-12-02 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 4 of 5One triplet of digits (in Numbers) Rating: 3.50
Posted on 2017-12-01 by Ady TZIDON (No Solution Yet, 6 Comments)
Difficulty: 4 of 5Peace, no war (in General)
Posted on 2017-11-30 by Ady TZIDON (No Solution Yet, 3 Comments)
Difficulty: 3 of 5A square pairing (in Numbers)
Posted on 2017-11-29 by Ady TZIDON (Solution Posted, 1 Comments)

Recently Posted Solutions:
Difficulty: 3 of 5Nine nine-digits results (in Just Math)
Submitted By Ady TZIDON. Solution posted on 2017-12-06 03:32:43
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Submitted By Ady TZIDON. Solution posted on 2017-12-03 00:46:31
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