pi
11-16-2012, 10:37 AM
#1
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Join Date: May 2008
Location: MN
Posts: 24,390
pi
My calculator gives the value of pi as: 3.14159365359
My calculator give the value of 22/7 (3-1/7) as: 3.14285714286
22/7 has a repeating decimal as the value and, as far as I know, pi goes on forever.
Anyway -
for most purposes in my life - as in drafting a pattern - 22/7 - works well enough for most calculations.
0.00126 - a bit more than one-thousandth of an inch variation will probably work well enough with 'a scant quarter inch' seam
My calculator give the value of 22/7 (3-1/7) as: 3.14285714286
22/7 has a repeating decimal as the value and, as far as I know, pi goes on forever.
Anyway -
for most purposes in my life - as in drafting a pattern - 22/7 - works well enough for most calculations.
0.00126 - a bit more than one-thousandth of an inch variation will probably work well enough with 'a scant quarter inch' seam
11-16-2012, 06:47 PM
#3
Junior Member
Join Date: Sep 2012
Location: Pacific Northwest
Posts: 121
The calculator value is much more accurate. 22/7 is an approximation for use with fractions. As you say, however, either one is close enough to get you scant quarter seamline.
laura
laura
Originally Posted by bearisgray
My calculator gives the value of pi as: 3.14159365359
My calculator give the value of 22/7 (3-1/7) as: 3.14285714286
22/7 has a repeating decimal as the value and, as far as I know, pi goes on forever.
Anyway -
for most purposes in my life - as in drafting a pattern - 22/7 - works well enough for most calculations.
0.00126 - a bit more than one-thousandth of an inch variation will probably work well enough with 'a scant quarter inch' seam
My calculator give the value of 22/7 (3-1/7) as: 3.14285714286
22/7 has a repeating decimal as the value and, as far as I know, pi goes on forever.
Anyway -
for most purposes in my life - as in drafting a pattern - 22/7 - works well enough for most calculations.
0.00126 - a bit more than one-thousandth of an inch variation will probably work well enough with 'a scant quarter inch' seam
11-16-2012, 07:13 PM
#7
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Join Date: Dec 2009
Location: Outside St. Louis
Posts: 38,181
My Granddaughter is taking college math and not getting it. I'm no good, I think the basics are plenty for the average person. I learned fractions by using them in cooking and baking, doubling recipes made them second nature to me. I do love calculators.
Spelling use to be the easiest thing for me but as I age, not so much.
Spelling use to be the easiest thing for me but as I age, not so much.
11-18-2012, 04:24 AM
#8
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Join Date: Feb 2010
Location: Tucker, GA
Posts: 2,042
Help with college algebra
Originally Posted by Jingle
My Granddaughter is taking college math and not getting it. I'm no good, I think the basics are plenty for the average person. I learned fractions by using them in cooking and baking, doubling recipes made them second nature to me. I do love calculators.
Spelling use to be the easiest thing for me but as I age, not so much.
Spelling use to be the easiest thing for me but as I age, not so much.
