Age has been definately taking its toll on me lately....l am fabricating a simple sea bag/ duffle bag and have forgotten how to calculate the diameter required for the bottom of the bag..it is , of coarse ..round and will need allowance for sewing to the sides of the bag..the bag walls are completed and when laid flat measure 18 3/4 inches which means the perimeter would be 37 1/2 inches...do l have to multiply 37.5x3.14 to arrive at the diameter?????
LOST IN MY MIND>>>CAN"T FIGUE A WAY OUT! ???
Dave
http://math.about.com/library/blcirclecalculator.htm (http://math.about.com/library/blcirclecalculator.htm)
:D
try this I made .
you need Adobe Acrobat to open it
not sure how long the link will last
https://snuggtopz.sharefile.com/f/fodec8cf-c95a-4add-b4f6-3ff96e750a2c
let me know how it works for you.
Rich
Found on the internet
If you know the radius, then the diameter is 2R.
If you know circumference, then the diameter is C/(pi).
If you know the area, then the diameter is the square root of 4A/(pi).
R is the radius of a circle,
C is the circumference and
A is the area
Done!..Just a brain fart..thanks guys!
Dave