Ok, This is probably a really basic question but. I should know exactly how I can find out how large a round is. For example, a tennis round is 2 1/2 inches big, yet how carry out you discover that?

Though, because that reference, the explanation and answer come this question demands to be as straightforward as it can possibly get. I have a learning impairment that greatly affects my piersonforcongress.comematics capabilities and also severe Dyscalculia. This explanation right here probably provides me sound pretentious, however a many of world don\"t understand or they throw too countless numbers in ~ me and also get frustrated once I haven\"t stated anything before hand. I\"m i m really sorry if it does, but I\"m spanning all my bases lol.

Any assist on exactly how to figure this inquiry out is an extremely much appreciated!




You are watching: How to measure the diameter of a ball

circles
share
cite
monitor
asked Jun 19 \"15 in ~ 19:37
\"*\"

AmandaAmanda
1311 silver badge33 bronze title
$\\endgroup$
4
include a comment |

3 answers 3


energetic oldest Votes
2


See more: 1,000,000 Yen In Usd - 1000000 Jpy To Usd (Yen To Us Dollar)

$\\begingroup$
One easy way to measure the \"size\" of a round is how much it is from next to side. Her tennis ball instance is a an excellent one: a typical tennis sphere is around 2.5 inches kind side to side. And one way to measure that size is to place the round on a table in the sunlight when the sunlight is practically overhead -- close to noon.

The ball\"s zero is then virtually a circle, and you deserve to measure the width of the circle through a ruler, and also that\"ll be the width of the ball as well.

Another method to measure this is to placed the ball in between two (large) books and also hold the books parallel; it\"s then easier to measure up the distance between the publications with a ruler.

Finally, you have the right to wrap a string approximately the center of the round -- the very widest part, prefer wrapping about the equator of the planet -- and also mark the string with a pen so that in between the two pen-marks is precisely one trip around the ball\"s middle. Suppose that this comes out to be 42 inch (which might happen because that a kid\"s kickball, for instance). If you divide the size (42 inches) by the number 3.14, girlfriend get

42 / 3.14 = 13.38, much more or less

and the tells you that the ball is a little more than 13 customs across.

The number 3.14 is unique -- it works no issue how large your round is: you divide the \"length approximately the ball\" by 3.14 and you acquire the length across the ball. (The actual number is a tiny little bit bigger 보다 3.14, but the distinction only matters once you\"ll act very an accurate things; 3.14 functions for virtually all helpful purposes.)