Question

Please help, I really need to know how to do it

Answer 1

Answer: It is roughly 25.12 or 8π

Explanation:

Well, it depends if you are using 3.14 as a subsitute for Pi, or you are just using the Pi symbol (π). Let me explain better:

The equation for solving the circumference of a circle is C=2πr

R is the radius, which is the 4 in the problem. If you were just using the Pi symbol, you would multiply 2*4 because you plugged 4 into the equation above. This would result in C=8π.

If you were using 3.14, you would subsitute both 3.14 and 4. So it would be C=2(3.14)(4) which would be 25.12

Hope this helped! (By the way, if it is wrong, I have not gotten this in my math class yet). ALSO remember to check whether the homework is using 3.14 for Pi or you just using the Pi symbol. And to put the squiggly equation symbol which means about.

Answer 2

So heres what I think

C=2pie r

C=2*3.14*4

c=25.12

So basically half the circle is the radius and the whole is the circumference. So what you are doing is changing pie to 3.14 (since pie=3.14), since half the circle its radius so all you have to do is 2 times 3.14 times 4 to get 25.12 as your circumference.

Hope this helps!

Explanation: