The penguin exhibit at a zoo has raised circular island that is surrounded by water. diameter of the island is 20 meters. one swims halfway how far did he swim?

Question

im tyinng to get my khan academy just answer these answers for the answer god ok bro im just tryna pass

Answer 1

Hi Luke

 

Calm down, you'll get there.The island is a circle, and the distance around any circle is called the circumference.  C= πd  Diameter = 20, so the circumference is 20 π.  He swam only halfway around, so it is (1/2) ( 20 π) or 10 π.  The question may ask you to give the answer to the nearest tenth or some other place value, in which case you can use 3.1427 or whatever they suggest for pi and round.  For the exact answer, you have to leave it in terms of pi, so 10 π.

Mary