Are You Good At Maths??

POSSETTE

I have been selling hanging topiary balls for a year now on ebay.But i was stumped by a question from a poss buyer..

My balls (excuse the way that sounds!) are 23 and 28cm diameter which i put on the listing.

I'd ran out of the larger ones when someone asked me the circumference of them!! as you do...

so i dragged my mind back20 years to school and came up with
"the circumference of a circle is PI r squared"

so therefore PI = 3.14 x radius x radius...are you with me so far?

3.14 x 14 x 14 = 615.44 :eek: (14 being radius of 28cm balls)

There is NO WAY that is the circum???!! they are approx 75cm as i have now found out.
But why wont that equation work out?
what have i done wrong?Hubby good at maths but he couldnt get it either, i did get the o level honest!

jm2926

PI r squared is the area, circumference is Pi x d:

PI x 28 = 3.14 x 28 = 87.92cm.

Can't imagine why anyone would ask the circumference though - surely the diameter you already provide would be all that's needed.

tillybilly_2

hi there, diameter is 2 pie r so 2*3.14* radius (half of diameter = 14) = 87.4cm

dotchas

Gosh ,that takes me back..........

fuzzgun19

Why dont you just get a tape measure and measure it all the way round?

..or Try this

http://en.wikipedia.org/wiki/Circumference

ormus

for rule of thumb just use 3 x Diameter.
ie 30 cms x 3 = 90 cms.
close enough for an enquiry on ebay. and always use the word "approx".
some morons can come back and haunt you, if not exact!

doodledo_2

People are bonkers with the questions they ask :rotfl: and surely the time it took them to write to you that could have worked it out themselves.

ormus

doodledo wrote: »

People are bonkers with the questions they ask :rotfl: .

my SIL was asked to deliver a table and chairs in time for xmas, and she wanted to pay at the end of the month when her husband got paid!

POSSETTE

fuzzgun19 wrote: »

Why dont you just get a tape measure and measure it all the way round?

..or Try this

http://en.wikipedia.org/wiki/Circumference

Because i didnt have a large ball to measure when she asked!

But thanks everyone..sorted!!
brain can go back to bed for another year now..:rotfl: