High School math quiz...

elevmike · Mar 27, 2006

Ok guys & gals,

Given the end points on a Cartesian plane: (x1, y1), (x2, y2) and the radius, how do you find the length of an arch...

Gone brain dead and trying to figure out the lenth of a drag link..

Maybe this is better; the arc angle is 135 deg and the radius is 23.60

elevmike · Mar 27, 2006

dauhaaaa.... nevermind

Steve Bailey · Mar 27, 2006

Convert the angle from degrees to radians and multiply it by the radius.

elevmike · Mar 27, 2006

Thanks Steve,

I took the full circumfrence and multiplied it by (arc / 360).

RussB · Mar 27, 2006

You guys are good! I would have to look it up.
Or
Did you too?

elevmike · Mar 27, 2006

No I didnt, it just dawned on me.

Pi R^2 = full circumfrence. 135/360 * full circumfrence = my answer.

bernie_carlton · Mar 27, 2006

Circumfrence = Pi * R * 2 (not ^ 2) Pi * R^2 = area of the circle

elevmike · Mar 27, 2006

Ha Ha... told you I was brain dead tonight....

I did caluculate it right in my CAD though...

RussB · Mar 27, 2006

If I think about it long enough it is a logical conclusion, given the facts that I have absorbed over the years, thanks to a couple of very good Geometry profs. (And a "Male" approach to my spacial environment!)

Steve Bailey · Mar 28, 2006

One of the definitions that I can still remember is that one radian is the angle formed when the arc length of a circular segment equals the radius.

Had I not remembered that, I probably would have figured it out using the proportional method that Mike used.

elevmike · Mar 28, 2006

A couple of years ago we had a 20 year old kid working here who was a human calculator. For some odd reason he had a 4.0 HS grade point but never applied for college. I encouraged him to go back to school. Eventually he did & now I really miss him.

bentleya · Mar 28, 2006

PiD......

See how our world ties together....

High School math quiz...

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