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Old 03-12-2019, 02:41pm   #1
Defib1961
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bilmem Geometry help.

I never was good at geometry. Someone would ask me to find an angle, all I could do was point at a crooked line and say, "There it is."

So here is the question: Side "A" is 6 inches long, Hypotnuese is 29.5 inches long, Side B is 29 inches long. What the hell is my angle?

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TIA!
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Old 03-12-2019, 02:47pm   #2
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I was very good at geometry. But that was 50 years ago.
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Old 03-12-2019, 02:54pm   #3
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https://www.mathsisfun.com/algebra/t...-triangle.html
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Old 03-12-2019, 03:14pm   #4
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Quote:
Originally Posted by Defib1961 View Post
I never was good at geometry. Someone would ask me to find an angle, all I could do was point at a crooked line and say, "There it is."

So here is the question: Side "A" is 6 inches long, Hypotnuese is 29.5 inches long, Side B is 29 inches long. What the hell is my angle?

Attachment 23958

TIA!
sine = opposite/hypotenuese

sine of small angle = 6/29.5 = 0.23389

so angle = 11.74 degrees.
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Old 03-12-2019, 03:18pm   #5
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sin(a) = 6/29.5

a = 11.73 degrees

The other angle is 90-11.73 = 78.27 degrees
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Old 03-12-2019, 03:24pm   #6
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To work it out just using the two sides (not the hypotenuse) then it would be:

tan(a) = y/x = 6/29

a = arctan(6/29) = 11.69 degrees

I'm thinking this is really your angle since there's no way your hypotenuse is 29.5 with the other two sides being 29 and 6 respectively. There's a measurement error there. I mean, it's probably very close to 29.5, but if the other two sides are precisely 29 and 6 respectively, the hypotenuse is actually:

sqrt(6^2 + 29^2) = 29.61 inches.
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Old 03-12-2019, 03:27pm   #7
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if you don't have a calculator handy, you can also solve this on the slide rule, using the C and D scales to find 6/29.5 = 0.203, and then flipping it over to read the angle off the S scale = 11.74 degrees.

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Old 03-12-2019, 03:32pm   #8
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And children, always remember, all you need to totally know everything about a right triangle is, other than it's a right triangle, is two more pieces of information. The length of any two sides, or a side length and an angle. That's it!
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Old 03-12-2019, 04:32pm   #9
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Hope this helps...

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Old 03-12-2019, 06:35pm   #10
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Quote:
Originally Posted by Defib1961 View Post
Hypotnuese
That's racist!
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Old 03-12-2019, 07:22pm   #11
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Quote:
Originally Posted by Defib1961 View Post
I never was good at geometry. Someone would ask me to find an angle, all I could do was point at a crooked line and say, "There it is."

So here is the question: Side "A" is 6 inches long, Hypotnuese is 29.5 inches long, Side B is 29 inches long. What the hell is my angle?

Attachment 23958

TIA!
With side "a" at 6" long and the hypotenuse at 29.5 inches long, angle "A" is 11.735

Right Scalene Triangle
Side a = 6
Side b = 28.88339
Side c = 29.5

Angle ∠A = 11.735 = 1144'7" = 0.20482 rad
Angle ∠B = 78.265 = 7815'53" = 1.36598 rad
Angle ∠C = 90 = 1.5708 rad = π/2


With side "a" at 6" long and side "b" at 29" long, angle "A" is 11.689

Right Scalene Triangle
Side a = 6
Side b = 29
Side c = 29.61419

Angle ∠A = 11.689 = 1141'22" = 0.20402 rad
Angle ∠B = 78.311 = 7818'38" = 1.36678 rad
Angle ∠C = 90 = 1.5708 rad = π/2


~~~~~~~~~~~~~~~~~~~~

I used this on line calculator to copy the info for pasting
https://www.calculator.net/triangle-calculator.html

I also used my machinist calculator and came up with the same values.
https://www.ebay.com/itm/Calculated-...frcectupt=true

Now if I was making this part for you, you would have gotten a phone call or an email asking which values to use.
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machinist calc pro.jpg  

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Old 03-12-2019, 07:43pm   #12
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42.
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Old 03-12-2019, 08:31pm   #13
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Quote:
Originally Posted by JRD77VET View Post
With side "a" at 6" long and the hypotenuse at 29.5 inches long, angle "A" is 11.735

Right Scalene Triangle
Side a = 6
Side b = 28.88339
Side c = 29.5

Angle ∠A = 11.735 = 1144'7" = 0.20482 rad
Angle ∠B = 78.265 = 7815'53" = 1.36598 rad
Angle ∠C = 90 = 1.5708 rad = π/2


With side "a" at 6" long and side "b" at 29" long, angle "A" is 11.689

Right Scalene Triangle
Side a = 6
Side b = 29
Side c = 29.61419

Angle ∠A = 11.689 = 1141'22" = 0.20402 rad
Angle ∠B = 78.311 = 7818'38" = 1.36678 rad
Angle ∠C = 90 = 1.5708 rad = π/2


~~~~~~~~~~~~~~~~~~~~

I used this on line calculator to copy the info for pasting
https://www.calculator.net/triangle-calculator.html

I also used my machinist calculator and came up with the same values.
https://www.ebay.com/itm/Calculated-...frcectupt=true

Now if I was making this part for you, you would have gotten a phone call or an email asking which values to use.
Slide rule!
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Old 03-12-2019, 08:35pm   #14
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Quote:
Originally Posted by DAB View Post
Slide rule!
I haven't handled a slide rule since junior high school.
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Old 03-12-2019, 08:45pm   #15
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Quote:
Originally Posted by JRD77VET View Post
I haven't handled a slide rule since junior high school.
Have one on my desk. Been learning how to use it lately.
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Old 03-12-2019, 08:57pm   #16
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Quote:
Originally Posted by JRD77VET View Post
I haven't handled a slide rule since junior high school.
I've got a friend that was on a slide rule kick a few years ago. Buying them at flea markets and antique stores. He was hell bent on ignoring modern technology.

When he finally got a smart phone, he downloaded a rotary dial app for it.
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Old 03-12-2019, 09:01pm   #17
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Quote:
Originally Posted by chinaski View Post
That's racist!
This is what I imagine........




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Old 03-12-2019, 09:01pm   #18
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Quote:
Originally Posted by chinaski View Post
I've got a friend that was on a slide rule kick a few years ago. Buying them at flea markets and antique stores. He was hell bent on ignoring modern technology.

When he finally got a smart phone, he downloaded a rotary dial app for it.
Tell him if he had a real rotary phone, he could dial just by clicking the button on the cradle that hangs it up
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Old 03-13-2019, 01:35am   #19
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I have an old ATT stepper relay laying around here...that means I am without question the most biggest nerd here in this group.....

Hell, I even have a Klystron Oscillator tube on the window sill.....
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Old 03-13-2019, 05:17am   #20
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I often make use of hypotenuse while squaring construction. I don't know what the hell it is but I use it somehow.
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