A circle has a radius of 20 cm. = 3.14
What is its perimeter (to the nearest tenth)? ____ cm

What is its area (to the nearest tenth)?____ cm2

Question

A circle has a radius of 20 cm. = 3.14
What is its perimeter (to the nearest tenth)? ____ cm

What is its area (to the nearest tenth)?____ cm2

anonymous · Answer

Well the formula for perimeter is $$2(\pi)(r)$$

anonymous · Answer

So just plug in the radius for r and you've got that part

anonymous · Answer

125.60

anonymous · Answer

but it says to the nearest tenth 125???

anonymous · Answer

No that would mean round so that there is one number after the decimal. Also did you use 3.14 or the pi button on a calculator? I got 125.7 which is a little more accurate

anonymous · Answer

3.14

anonymous · Answer

Alright, if you have a pi button on your calculator you should use that, itll always give you a more accurate answer. I used it and got 125.66, round that to the nearest tenth and you get 125.7cm for the perimeter

anonymous · Answer

will you look with me at another problem plz

anonymous · Answer

The second part? The area?

anonymous · Answer

i got for are 1,256.0

anonymous · Answer

Again I used the pi button and got 1256.63 which to the nearest tenth is 1256.6cm^2

anonymous · Answer

yes that's what i just got after using pi

anonymous · Answer

Alright so you got it now?

anonymous · Answer

yes thank you
can you look at one more with me im gonna post it

anonymous · Answer

Alright just post it as a new question and ill try it