# Geometry Forum

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

1. ### Find the area of a rectangle:Given coordinates of centroid and 1 pair opposite points

• Replies: 7
• Views: 1,669
Jun 23rd 2012, 08:52 AM
2. ### the circumference of a circle

• Replies: 9
• Views: 1,614
Jun 21st 2012, 06:08 AM
3. ### Degrees of a ten sided figure

• Replies: 2
• Views: 1,744
Jun 19th 2012, 10:58 AM
4. ### How many triangles?

• Replies: 2
• Views: 1,256
Jun 17th 2012, 06:55 AM
5. ### Yet Another Vectors Problem

• Replies: 2
• Views: 493
Jun 14th 2012, 07:04 AM
6. ### Coordinate geometry - Median

• Replies: 3
• Views: 2,701
Jun 12th 2012, 04:34 PM
7. ### Vectors

• Replies: 2
• Views: 640
Jun 11th 2012, 08:51 PM
8. ### Textbook advice - Euclid, Kiselev, or Lang?

• Replies: 0
• Views: 915
Jun 11th 2012, 04:48 PM
9. ### Prove Cosine law using vectors!

• Replies: 1
• Views: 879
Jun 10th 2012, 05:46 PM

• Replies: 4
• Views: 704
Jun 10th 2012, 02:18 PM
11. ### Prove this ratio. Help appreciated.

• Replies: 1
• Views: 643
Jun 10th 2012, 06:59 AM
12. ### Rectangle in a circle

• Replies: 1
• Views: 995
Jun 9th 2012, 11:22 AM
13. ### Can a Trapezoid have similar interior angles

• Replies: 4
• Views: 708
Jun 8th 2012, 10:48 PM
14. ### need help with angle-circle relationship rules

• Replies: 4
• Views: 1,032
Jun 8th 2012, 07:35 AM
15. ### Calculating perimeter with only area of a rectangle

• Replies: 9
• Views: 1,575
Jun 8th 2012, 07:12 AM
16. ### Regular polygon formula

• Replies: 8
• Views: 1,048
Jun 8th 2012, 06:19 AM

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### cosx= .4583?

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