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It has become obvious that the Shapes category was in way over its head with all sorts of geometrical problems. So, the hard-core Geometry problems will now reside here, where they will fit in much better.
Difficulty: 3 of 5 Latest: Decagonal Intersection Delight
You are given a regular decagon A1A2... A10. Let A be the intersection point of lines A1A4 and A2A5, B is the point of intersection of lines A1A6 and A2A7, and C is the point of intersection of lines A1A9 and A2A10. Find the angle of ABC.
(No Solution Yet, 2 Comments) Submitted on 2024-04-22 by Danish Ahmed Khan   
Page 5 of 46   << prev next >>    
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Posted on 2020-12-25 by Danish Ahmed Khan (No Solution Yet, 0 Comments)
Difficulty: 3 of 5Concyclic in a triangle |
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Difficulty: 1 of 5Measure angle in parallelogram |
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Difficulty: 3 of 5Perpendiculars in cyclic quadrilateral |
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Difficulty: 2 of 5Quick triangle side |
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Difficulty: 3 of 5Missing side of hexagon | Rating: 2.00
Posted on 2020-12-02 by Danish Ahmed Khan (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Find the third side |
Posted on 2020-11-27 by Danish Ahmed Khan (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Quad in quad |
Posted on 2020-11-20 by Danish Ahmed Khan (No Solution Yet, 0 Comments)
Difficulty: 3 of 5A triangle locus |
Posted on 2020-11-03 by Danish Ahmed Khan (No Solution Yet, 0 Comments)
Difficulty: 3 of 5Construction inside parallelogram |
Posted on 2020-10-29 by Danish Ahmed Khan (No Solution Yet, 0 Comments)
Difficulty: 3 of 5Triangle bisector |
Posted on 2020-10-18 by Danish Ahmed Khan (No Solution Yet, 2 Comments)
Difficulty: 3 of 5The angle bisectors |
Posted on 2020-10-10 by Danish Ahmed Khan (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Equilateral hexagon |
Posted on 2020-09-08 by Jer (No Solution Yet, 5 Comments)
Difficulty: 3 of 5Radius and Altitudes |
Posted on 2020-05-08 by Ady TZIDON (No Solution Yet, 3 Comments)
Difficulty: 4 of 5An envelope of line family |
Posted on 2020-05-06 by Danish Ahmed Khan (No Solution Yet, 3 Comments)
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