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Old 02 July 2007, 09:13 PM
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OllyK
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Default Trigonometry
My minds gone blank!

I want to work out an angle in a triangle and I've forgotten my COS / SIN stuff!

Right angle triangle,


|
51cm |
|_____________ A
157 cm

What's the angle at A?
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Old 02 July 2007, 09:17 PM
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tan A = 51/157

so, A=tan-1 (51/157) = 18 degrees
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Old 02 July 2007, 09:18 PM
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Indeed - figured it out from the inverse sin of the remaining side - ho hum, how red wine addles the brain!!

Cheers anyway
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Old 02 July 2007, 09:21 PM
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The Cat Sat
On An Orange
And Howled Horribly

Tan = opp / adj cos =adj /hyp etc
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Old 02 July 2007, 09:23 PM
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SOHCAHTOA was what I was taught, but I couldn't remember till just now
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Old 02 July 2007, 09:24 PM
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Any body remember
King Harry's Dog Doped Charlies Monkey
as a reminder for the metric measures?
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Old 02 July 2007, 09:24 PM
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Triangle Solutions Calculator - Engineers Edge
might help
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Old 02 July 2007, 09:51 PM
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soccertoa

soh cah toa
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Old 02 July 2007, 09:52 PM
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**** me i've just had to sit down and remember my trig for working out the pitch and area of 2 new rooves (sp) on the back of the house and now i see this on here .

sin(ang)=oppposite/hypotenuse SOH
cos(ang)=adjacent/hypotenuse CAH
tan(ang)=opposite/adjacent. TOA

Andy.
Last edited by andy_s37; 02 July 2007 at 09:52 PM. Reason: typo
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Old 02 July 2007, 10:35 PM
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Originally Posted by andy_s37
**** me i've just had to sit down and remember my trig for working out the pitch and area of 2 new rooves (sp) on the back of the house and now i see this on here .

sin(ang)=oppposite/hypotenuse SOH
cos(ang)=adjacent/hypotenuse CAH
tan(ang)=opposite/adjacent. TOA

Andy.
Exactly what I needed it for
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Old 02 July 2007, 10:36 PM
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Silly Old Harry
Caught a Herring
Trawling Off Africa
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Old 02 July 2007, 11:21 PM
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Sex On Holiday Can Always Have Two Other Advantages.

SOHCAHTOA.
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Old 02 July 2007, 11:30 PM
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Jamie
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90 degrees
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Old 02 July 2007, 11:36 PM
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yep i was just thinkin that
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Old 02 July 2007, 11:48 PM
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soh cah toa "soccatoa" was the way wewere taught to remember as well.
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Old 03 July 2007, 08:19 AM
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Originally Posted by *Jamie*
90 degrees
Eh?
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Old 03 July 2007, 08:26 AM
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trigonometry!

blast from the past
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Old 03 July 2007, 10:51 AM
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Some Old Hag Cracked All Her Teeth On Asparagus - That's the way I learned it..

The other one that was drummed in there is:
minusBplusorminusthesquarerootofBsquaredminusFourA CalloverTwoA
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Old 03 July 2007, 12:10 PM
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Well i never knew any of those mnemonics so I am very grateful for all that

Les
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Old 03 July 2007, 01:09 PM
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The one i use is

Silly Old Harry Chased A Horse Through Our Attic

SOHCAHTOA
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Old 03 July 2007, 01:12 PM
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Originally Posted by OllyK
Eh?
90 degrees - In a 90 deg triangle the square on the hypotenuse is equal to the sum of the squares on the opposite and adjacent faces.

Good for working out lengths but obviously no good if you require an angle.
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Old 03 July 2007, 01:51 PM
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Originally Posted by p1mark
90 degrees - In a 90 deg triangle the square on the hypotenuse is equal to the sum of the squares on the opposite and adjacent faces.

Good for working out lengths but obviously no good if you require an angle.
Ahhh, on a different tack.
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Old 03 July 2007, 02:04 PM
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Originally Posted by Leslie
Well i never knew any of those mnemonics so I am very grateful for all that

Les
Didn't you have to use spherical trigonometry when flying your planes; cotangents and haversines etc?
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Old 05 July 2007, 01:58 PM
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Originally Posted by Daryl
Didn't you have to use spherical trigonometry when flying your planes; cotangents and haversines etc?
Just the navigators-I am glad to say. I was too busy enjoying it for all that anyway.

Les
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