durr- maths question- help please!
Hi all,
can anyone help me. I have a circle with a 3m radius. The circle is split into 3 equal sctions all with 120 degree angles so a-b is 3m b-c is 3m what measurement is a-c? Anyone as noone in my office can remember how to work this out. Thanks guys xxx |
Re: durr- maths question- help please!
Originally Posted by kittycat1
(Post 9428922)
Hi all,
can anyone help me. I have a circle with a 3m radius. The circle is split into 3 equal sctions all with 120 degree angles so a-b is 3m b-c is 3m what measurement is a-c? Anyone as noone in my office can remember how to work this out. Thanks guys xxx Hmm, not sure what you are trying to solve? What do a, b, and c represent? If you want the area of the circle, it is Pi x Radius (3m) squared = 88.82m If you want the area of each segment if would be area/3 = 29.6m Alternatively if you want the outer edge of each segment if would be 1/3 of the diameter which would be radius*3= 6 (Diameter) then Diameter* Pi = 18.84 m / 3 = 6.28m per segment Hope it helps try www.mathgoodies.com |
Re: durr- maths question- help please!
ok its catwalk stage.
I need to know the length of the line between ac- so i know ab and bc are both 3 m- and the circle is split into 3 identical sections so must have 120 degree angle between ab and bc so i need the straight line length between a-c :confused: |
Re: durr- maths question- help please!
Originally Posted by kittycat1
(Post 9428944)
ok its catwalk stage.
I need to know the length of the line between ac- so i know ab and bc are both 3 m- and the circle is split into 3 identical sections so must have 120 degree angle between ab and bc so i need the straight line length between a-c :confused: |
Re: durr- maths question- help please!
1 Attachment(s)
this might help so I need a-c length
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Re: durr- maths question- help please!
I can honestly say I never thought I would use this information in real life! who knew eh!
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Re: durr- maths question- help please!
Originally Posted by kittycat1
(Post 9428944)
ok its catwalk stage.
I need to know the length of the line between ac- so i know ab and bc are both 3 m- and the circle is split into 3 identical sections so must have 120 degree angle between ab and bc so i need the straight line length between a-c :confused: |
Re: durr- maths question- help please!
|
Re: durr- maths question- help please!
5.2m
edit: this was rounded up, not worked out |
Re: durr- maths question- help please!
Thank you jack- just for my own sanity can you tell me how you worked that out xxx
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Re: durr- maths question- help please!
I drew it in CAD
edit... just redrew it to fix the error.... worked out perfectly to 5.196 http://imageshack.us/photo/my-images/836/trifw.jpg/ |
Re: durr- maths question- help please!
Originally Posted by kittycat1
(Post 9428955)
this might help so I need a-c length
Therefore Angle = 360/3 = 120 ; Cos 120 = -0.5 2-(-0.5) = 2.5 6 * 2.5 = 15m If we consider that the curved diameter of the segment was 29m, this sounds about right to me. I am sure there are some engineers on here who could check my calculus and if The Dean reads it and I have it wrong, my life will be hell !!! Hope it helps. |
Re: durr- maths question- help please!
whoops, I am out by a factor of three. If someone took the trouble to draw it out - take their advice, not mine
Hope it helps. |
Re: durr- maths question- help please!
Thanks everyone! really reallllllly appreciated!
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Re: durr- maths question- help please!
Originally Posted by kittycat1
(Post 9428955)
this might help so I need a-c length
So, in your case its about 5.196m if my dodgy maths skills hold true. |
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