The radius, diameter, or circumference of a circle is given. Find the missing measures. Round to the nearest hundredth if necessary.

d = 16.4 km., r = ? , C = ?

Question

The radius, diameter, or circumference of a circle is given. Find the missing measures. Round to the nearest hundredth if necessary.
 
d = 16.4 km., r =    ?   , C =    ?

anonymous · Answer

I know that r=3.28 but i dont know how to find c. please help? :(

kc_kennylau · Answer

$$C=2\times\pi\times r\C=\pi\times d\r=\frac d2\r=\frac C{2\pi}\d=2r\d=\frac C\pi$$

anonymous · Answer

can you put the numbers in? so i can get a real clear visual to work on the same problem as this one. i did it wrong

kc_kennylau · Answer

$$2r=d\2r=16.4km\r=8.2km$$
$$C=2\times\pi\times r=2\times\pi\times8.2km\approx51.522km$$

anonymous · Answer

thank you thank you!!

kc_kennylau · Answer

no problem :)

anonymous · Answer

this helped alot. now i know exactly what to do :)

kc_kennylau · Answer

glad to know :D