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31st May 2020, 07:49 | #1 |
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Help reqd with angels and Zeus
I need some help please working out angles and using my oh so very old Zeus book. It has been so long since I used if for angles I have forgotten how.
Please see this diagram taken from the internet. what is angle A and B? I know a and b. using a squared plus b squared I can work out c a = 24, b = 96, so I reckon c = 98.955 rounding to 3 decimal places my Zeus book says : data known b & c Tan B = b/c 96 divided by 98.955 = 0.97 This is where I am a bit lost. I think my Zeus book on a page that is titled Table of Natural Tangents has 0.97132 but I am unsure of the angle. Is the angle 44 point something? What is the something? macafee2 |
31st May 2020, 10:26 | #2 |
I really should get out more.......
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For things like this, I don't even bother with calculating. Had to do a lot of it at school and college so it's nice to simply use the internet! I think I'd struggle to calculate it without practice now. If you type in triangle calculator there are websites that work it all out for you. You only need three figures.
Your triangle is near enough a right angled triangle, and results are as follows Sent from my iPhone using Tapatalk
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31st May 2020, 11:19 | #3 |
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mm now thinking about my 44 degrees its way out, idiot.
14 degrees, thank you. No idea on your working out as I don't have a clue Still no idea how to use my Zeus book macafee2 |
31st May 2020, 12:36 | #4 |
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Didn't work any out! Just typed the lengths into a website that calculates it all out.
You can only calculate the angles of a right angled triangle when you know the length of at least two sides. If the triangle isn't a right angled triangle you wouldn't be able to calculate the unknown length using a2 + b2 = c2. You would have to make a right angled triangle and calculate the lengths and angles out. For that you'd use sohcahtoa Sine of opposite / hypotenuse Cosine of adjacent / hypotenuse Tangent of opposite / adjacent So if you take the triangle in my post above and we wanted to calculate the angle B we would need to calculate the cosine of the adjacent length divided by the hypotenuse 96/98.955 = 0.97 Then you'd look up the cosine of 0.97 in the tables and you'll find it's 14. So that's your angle. Then because you know it's a right angled triangle 180 - 90 - 14 = 76 which is near enough. But remember, it's only works with right angled triangles!!! If it's not a right angled triangle, there are lots of other ways to calculate. But in any case you need three lots of data. If you've only got two lengths you can't work anything else out. You can't even calculate the third length because you need at least one angle. So don't take that above as accurate because your triangle may not be right angled.
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31st May 2020, 14:07 | #5 |
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Reading these posts takes me back 60yrs to my school days. Still not got a clue what your talking about.
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31st May 2020, 14:54 | #6 | |
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Quote:
macafee2 |
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31st May 2020, 16:02 | #7 |
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This is the first image off google
Just read off the decimal numbers and it gives you the equivalent angle in degrees on the left 14 degrees is exactly 0.9703, but to two decimal places obviously is 0.97 therefore near as 14 degrees Sent from my iPhone using Tapatalk
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31st May 2020, 17:25 | #8 | |
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thank you rrobson mcafee2 |
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31st May 2020, 17:47 | #9 |
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You mixed up the lengths for a , b & c . in your diagram . "c " cannot be 24mm, if "b " is 96
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31st May 2020, 20:00 | #10 |
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