Ok, This is probably a really basic question but. I need to know exactly how I can find out how huge a round is. Because that example, a tennis sphere is 2 1/2 inches big, however how do you find that?

Though, because that reference, the explanation and also answer come this question needs to it is in as basic as it deserve to possibly get. I have a learning disability that heavily affects my barisalcity.orgematics capabilities and severe Dyscalculia. This explanation here probably renders me sound pretentious, yet a lot of people don"t understand or they litter too many numbers in ~ me and also get frustrated as soon as I haven"t claimed anything before hand. I"m sorry if it does, but I"m extending all mine bases lol.

Any aid on exactly how to number this question out is really much appreciated!

You are watching: How do you measure the diameter of a ball

point out
request Jun 19 "15 at 19:37

1311 silver- badge33 bronze title
add a comment |

3 answers 3

energetic oldest Votes

See more: How To Make Your Feet More Ticklish, Why Are Your Feet So Ticklish

One easy means to measure up the "size" the a ball is how far it is from next to side. Her tennis ball example is a good one: a common tennis round is around 2.5 inches type side come side. And one method to measure that size is to place the sphere on a table in the sunlight once the sunlight is virtually overhead -- close come noon.

The ball"s shadow is then nearly a circle, and you have the right to measure the width of the circle through a ruler, and also that"ll be the broad of the round as well.

Another means to measure this is to put the ball in between two (large) books and also hold the publications parallel; it"s then simpler to measure the distance between the books with a ruler.

Finally, you can wrap a string around the center of the sphere -- the really widest part, favor wrapping roughly the equator of the earth -- and also mark the string v a pen therefore that in between the two pen-marks is exactly one trip approximately the ball"s middle. Expect that this comes the end to be 42 inch (which might happen for a kid"s kickball, because that instance). If you division the size (42 inches) through the number 3.14, you get

42 / 3.14 = 13.38, an ext or less

and the tells you that the sphere is a little much more than 13 inch across.

The number 3.14 is distinct -- it works no issue how big your round is: you divide the "length approximately the ball" by 3.14 and also you acquire the length across the ball. (The yes, really number is a tiny little bit bigger 보다 3.14, however the distinction only matters when you"ll doing very an exact things; 3.14 functions for virtually all helpful purposes.)