Find the area and the circumference of a circle with diameter 6 ft. Use the value 3.14 for pi, and do not round your answers.

Question

jim_thompson5910 · Answer

You'll use these formulas


A = pi*r^2
C = pi*d


A = area
C = circumference
r = radius (half of the diameter)
d = diameter
pi = 3.14 approximately

jim_thompson5910 · Answer

keep in mind that r^2 is not the same as r*2

anonymous · Answer

So for the circumference, 3.14*6?

anonymous · Answer

Is the area 9ft^2 ?

jim_thompson5910 · Answer

area would be 9*pi = 9*3.14 = ??

anonymous · Answer

28.26?

jim_thompson5910 · Answer

yep that's the area

anonymous · Answer

18.84 is the circumference?

mathmale · Answer

@Snufflebug02:  Please be sure to include the correct units of measurement with your answers.  18.84 should not be left standing alone.  Neither should 28.26.

anonymous · Answer

18.84 ft^2 and 28.26 ft^2

anonymous · Answer

Is that correct?

jim_thompson5910 · Answer

`18.84 ft^2` is partially correct

the 18.84 is correct, but the units for circumference are going to be ft instead of ft^2

anonymous · Answer

Okay thank you! I have another question, if you have time :)

jim_thompson5910 · Answer

imagine you cut the circle and stretched it out to form a line like you see in this animation https://upload.wikimedia.org/wikipedia/commons/6/67/2pi-unrolled.gif

anonymous · Answer

A rectangle is placed around a semicircle as shown below. The width of the rectangle is 9 cm. Find the area of the shaded region. Use the value 3.14 for pi, and do not round your answer. Be sure to include the correct unit in your answer.

anonymous · Answer

Yes I understand now. Thank you for talking me through it

jim_thompson5910 · Answer

`A rectangle is placed around a semicircle as shown below`
you forgot to post the image

anonymous · Answer

I tried. I'm not sure how too

jim_thompson5910 · Answer

click the "attach file" button

or host the image on a site like imgur then post the link

anonymous · Answer

I don't see an "attach file" button. 
how do i use imgur?

jim_thompson5910 · Answer

you go to http://imgur.com/ then drag and drop your image to upload it then share the link here

anonymous · Answer

It's not letting me. I'll try to explain it. Its a rectangle with a semicircle inside of it. And the top right and left corners are shaded in. That is the area that we need to find

anonymous · Answer

I'm sorry if this is difficult

jim_thompson5910 · Answer

like this?

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