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

anonymous · Answer

I got 



r = 32.8 mm, C = 51.52 mm  but that wasnt the right answer. I did the problem wrong :(

solomonzelman · Answer

Diameter is twice the radius |dw:1387207121493:dw|

anonymous · Answer

i dont get that radius stuff

anonymous · Answer

but continue on :) im gonna study all that

solomonzelman · Answer

$$C=2πr=dπ$$|dw:1387207319402:dw|

solomonzelman · Answer

see the radius and diameter?

anonymous · Answer

yeah i get it now :) thanks

anonymous · Answer

the diameter is the longest one and the radius is at the edge of the center

solomonzelman · Answer

yes.

solomonzelman · Answer

|dw:1387207615008:dw|the circumference is the edge of the circle.
(not the area or the radius or diameter)

anonymous · Answer

ohhh... okay i see

anonymous · Answer

well how do you do this?

solomonzelman · Answer

$$π~≈~3.14$$ALWAYS.$$d=16.4$$(in your question)$$π \times d~=~C$$$$3.14 \times 16.4~=~51.496≈ 51.5$$

solomonzelman · Answer

$$2r=d~~~~~~~~~~~~~~~~~~~~(ALWAYS)$$$$if~~~~~~~~~~~~~~d=16.4$$$$16.4=2r~~~~~~~~~~~->~~~~~~~~~r=8.2$$

anonymous · Answer

ohhh okay thank you! i did the opposite of that. i got it now you explain very well

solomonzelman · Answer

Anytime!