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# Forum: Geometry and Trig

1. ### Sticky: Read Before Posting!!

• Replies: 0
• Views: 26,852
Ted
02-21-2006, 12:22 AM
1. ### Trig Identities: cos^2(2x) + sin^2(2x), os^2(x)-1/sin(x),

• Replies: 1
• Views: 116,489
04-07-2008, 01:06 PM
2. ### 1+sinx/cosx + cosx/1+sinx = 2secx

• Replies: 4
• Views: 63,547
10-02-2006, 10:37 AM
3. ### solve without calculator

• Replies: 6
• Views: 60,217
09-23-2008, 08:26 AM
4. ### Cubes and box question

• Replies: 9
• Views: 59,647
09-06-2012, 12:30 AM
5. ### Determine diameter of a circle from a straight line

• Replies: 5
• Views: 55,132
06-02-2014, 11:48 PM
6. ### Show that the 4 points all lie on the same plane

• Replies: 3
• Views: 42,308
pka
05-25-2006, 04:08 PM
7. ### Convert the equation to polar coordinates, y=x^2

• Replies: 3
• Views: 41,972
07-21-2011, 07:58 PM
8. ### verify 1/secx-tanx= tanx+secx

• Replies: 4
• Views: 41,399
04-06-2013, 04:53 PM
9. ### Tan, Cos, and Sin... To the nearest degree.

• Replies: 3
• Views: 41,177
09-25-2008, 03:56 AM
10. ### How to find the coordinates of the vertices of a triangle given the midpoints..help!

• Replies: 5
• Views: 40,938
01-29-2012, 07:57 PM
11. ### Help finding missing endpoint if E is the midpoint of DF. F(5, 8) , E(4, 3)

• Replies: 3
• Views: 40,373
09-27-2016, 08:09 PM
12. ### finding the apothem, area, and perimeter of regular polygon

• Replies: 4
• Views: 39,604
06-03-2007, 03:47 PM
13. ### Tan (a+b+c) =????

• Replies: 6
• Views: 39,203
11-22-2012, 11:45 PM
14. ### need to find radius of cylinder, given height, surface area

• Replies: 1
• Views: 38,145
06-03-2006, 08:59 PM
15. ### csc x - sin x = cot x * cos x

• Replies: 3
• Views: 36,930
06-02-2006, 04:23 PM
16. ### Trig problem sin(Ø + pi/4)

• Replies: 5
• Views: 36,732
06-08-2008, 10:38 PM
17. ### Area of a Triangle Formula: inradius & semiperimeter

• Replies: 10
• Views: 36,729
06-08-2006, 07:09 PM
18. ### converting degrees to feet

• Replies: 3
• Views: 35,872
02-08-2008, 03:49 PM
19. ### solve sin^2(theta)-cos^2(theta)=0 over interval [0, 2pi]

• Replies: 3
• Views: 34,619
07-10-2007, 02:02 AM
20. ### Finding the the radius of a circle using S=Ør

• Replies: 4
• Views: 33,527
06-08-2008, 03:21 PM

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