Answer:
Red circle: 30 cm
Blue circle: 60 cm
Step-by-step explanation:
The circle's circumference is calculated with
They want you to make it <em>about</em> how long it is so instead of pi we can just use 3 (since pi is about 3,14). The diameter (d) is double the ratio.
So now we just put in the numbers.
For the red one
The circumference is about 30 centimetres.
For the blue one
We know the ratio of the smaller so we just add together the small ratio with the rest of the length that we know so the blue one's ratio is 10 cm. (5+5=10)
And now we just put the numbers in again.
The circumference is about 60 centimetres.
Step-by-step explanation:
first we need to round 1.37 which you get 1.35 then round 0.9 to 1.0 then add them both which you get 2.35
Answer:i cant see the whole answer.
Step-by-step explanation:
Answer:
There's a lot of them.
There are many different ways to calculate 
. The ones used by computers to generate tons of digits are usually infinite series.
The series that has been prominent in recent records for the most digits of pi is the Chudnovsky algorithm.
The algorithm is this:
For faster performance, it can be simplified to this:
Other algorithms have been used, but right now this is the one that is being used to set the recent records.
There are also some approximations that are used because they are very easy to calculate.
first, 
can be used to calculate a fairly accurate pi, but a better rational approximation is 
This fraction is actually accurate to 6 digits and it is the best approximation of in simplest form and with a denominator below 30,000.
There are several other approximations and if you want to learn more I would recommend looking at the Wikipedia page which has tons of algorithms for pi.
