Question

the circumference
of a circle is 16 prsquard find its radius and area

Answer 1

what is prsquard?

Answer 2

3.14

Answer 3

so circumference of a circle is 16pi?

Answer 4

assuming that...C = 2piR
16pi = 2piR
8 = Radius
A= piR^2
you can do the rest

Answer 5

yes

Answer 6

did you get this?

Answer 7

no I M stuck where sheng left off
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Answer 8

do you multipy 8 by 3.14 then square

Answer 9

But you did follow how he got the radius?

Circumference = 16 * pi (given in the problem)
= 2 pi * radius
So 16 * pi = 2 * pi * radius
Next, divide both sides by 2*pi:
(16 * pi) / (2 * pi) = (2 * pi * radius) / (2 * pi)
which simplifies to 8 = radius

Area is equal to pi * radius squared, or pi * radius * radius
So that would be pi * 8 * 8, or 64 * pi
If you have been told to estimate pi as 3.14, that's fine... then you multiply 64 by 3.14 to find the area.

Answer 10

Shorter answer to your last question, no, you first square the radius, THEN multiply by 3.14

Answer 11

It's like:\[\pi \times (radius ^{2})\]

Answer 12

ok so if i take 8 times 8 times 3.14 I get 64 times 3.14 which comes out to 200.96

Answer 13

ok, sounds good to me :)

Remember, in case it matters, that the units for area are going to be "square" something... square centimeters or inches or miles or whatever. Length is just like meters or inches, but area is square units.

Answer 14

i typed that in and it was wrong for the area its inches squared

Answer 15

are you sure you are supposed to use 3.14 for pi?

Answer 16

Also, your initial post of the question had typos... might be good to double check the question you're seeing online and paste it again or take a screenshot or something... But if you're sure it says "circumference = 16 pi", I will believe it :)

Answer 17

its has that in it

Answer 18

is in the problem

Answer 19

it looks like you typed in "64" in the blank for area.

The page's instructions say to type in an exact answer in terms of "pi".

So don't do that last step where you made "pi" equal to 3.14... just leave it as "pi"

So your area would be "pi" x "8 squared", or 64 pi. Type 64 in that blank, then use the pi symbol button over on the left to add the pi symbol in after the 64 in the blank.

Answer 20

k thanks