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Maths question...

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CheffoJeffo:


--- Quote from: holdennut on June 12, 2006, 11:14:54 am ---Cheers Dustin, that's the one but I can't get it to work. What does ^ represent? (multiply, divide)

--- End quote ---

"To the power of" ? (e.g. squared)

Cheers.

holdennut:

Cheers Cheffo, this time r = 807 which sounds just about right!

I really should have paid more attention at school.  :dizzy:

ahofle:

http://mathpwned.ytmnd.com/

 ;D

jbullfrog:

The formula that was given assumes that you're starting your cut at a 90 degree angle (perpendicular) to the top edge (should the top edge have been parallel to the ground); from your pic it doesn't look as though you wanted a cut that was 90 degrees from being parallel to the ground, but wanted something that was a bit more sloped at the top.  If I'm wrong about this, please disregard everything that follows... ;)

Because you don't want a 90 degree cut at the top, the formula will give you an 'r' that is a bit too small...  if you don't feel the need to be exact, just increase 'r' an inch or two from what the formula gives you...  draw it out for one inch, then draw it out for two inches...

Does this all make sense?

Quarters:

If you want a more hands on approach, you can use circles to figure it out. See pic below.

1.) Draw 2 dot anywhere on your arc.
2.) Make small identical circles centered on each dot.
3.) Make larger circles centered where your small ones cross the arc.
4.) Make strait lines though where your larger circles intersect.
5.) Measure from where your 2 lines cross to your arc. this is your radius. (the green line)

hope this helps.

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