# Geometry Forum

Geometry Help Forum: Euclidean, basic geometric proofs, volumes, perimeters

1. ### How can I express this with mathematical notation?

• Replies: 1
• Views: 648
Aug 13th 2011, 08:14 AM

• Replies: 1
• Views: 471
Aug 12th 2011, 07:08 PM
3. ### Lengths of Triangles

• Replies: 4
• Views: 523
Aug 10th 2011, 07:15 PM
4. ### vector

• Replies: 1
• Views: 443
Aug 9th 2011, 05:40 PM
5. ### Help in proving these two line segments are congruent?

• Replies: 15
• Views: 2,378
Aug 9th 2011, 03:19 PM
6. ### Can't find circumcentre of this triangle - stuck at system of equations

• Replies: 1
• Views: 850
Aug 9th 2011, 01:52 PM
7. ### Considering a set 'G' proove the number of possible parallelograms

• Replies: 1
• Views: 517
Aug 9th 2011, 12:39 AM
8. ### My Geometry Problem

• Replies: 1
• Views: 758
Aug 6th 2011, 06:16 PM
9. ### 90-135 degree angle on vertice

• Replies: 0
• Views: 754
Aug 6th 2011, 03:51 PM
10. ### Point inside a parallelogram.

• Replies: 1
• Views: 1,289
Aug 6th 2011, 01:16 PM
11. ### Model of Shell Growth

• Replies: 2
• Views: 2,338
Aug 5th 2011, 06:56 PM
12. ### Finding the Centroid of this triangle - stuck!

• Replies: 4
• Views: 593
Aug 5th 2011, 01:18 PM
13. ### [SOLVED] Angle between 2 lines proof

• Replies: 2
• Views: 1,406
Aug 4th 2011, 10:58 AM
14. ### Couldn't solve this question about right triangles proportions.

• Replies: 11
• Views: 941
Aug 3rd 2011, 10:41 PM
15. ### Hilbert's Axioms

• Replies: 6
• Views: 826
Aug 2nd 2011, 04:46 AM
16. ### Non-Euclidean Space

• Replies: 10
• Views: 901
Aug 2nd 2011, 12:17 AM
17. ### Writing a formal proof for this statement?

• Replies: 6
• Views: 703
Aug 1st 2011, 01:17 PM
18. ### Circles and Dreamcatchers

• Replies: 1
• Views: 591
Aug 1st 2011, 11:47 AM
19. ### Area of circle inscribed in a square.

• Replies: 1
• Views: 866
Aug 1st 2011, 11:22 AM

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### cosx= .4583?

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