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OpenStudy (anonymous):
OpenStudy (phebe):
A=πr2=π·52≈78.53982
OpenStudy (phebe):
wait nvm
OpenStudy (phebe):
Answer is: 78.54
OpenStudy (phebe):
ohh wait non of ur answer choices say that so hodl on
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OpenStudy (anonymous):
\[Area~of~a~circle= \pi(radius)^2\]
OpenStudy (anonymous):
Dont give direct answers @Phebe
OpenStudy (phebe):
yah ik that i showed my work but it showed question mark
OpenStudy (anonymous):
5 is the Radius?
OpenStudy (anonymous):
Just showing you work doesnt work either, walk them through it.
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OpenStudy (anonymous):
Yes 5 is the radius
OpenStudy (phebe):
do 5*3.14
OpenStudy (anonymous):
Dont do this^
OpenStudy (phebe):
The area of a circle is π (Pi) times the Radius squared, which is written:
A = π × r2
Or, when you know the Diameter:
A = (π/4) × D2
Or, when you know the Circumference:
A = C2 / 4π
OpenStudy (anonymous):
Remember radius^2(pi)
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OpenStudy (anonymous):
So do 3.14 which is pie multiple by 5?
OpenStudy (anonymous):
No 5 squared time 3.14
OpenStudy (phebe):
Use this formula to help u get the abswer
A = π × r2
just fill in for the numbers
OpenStudy (phebe):
im going to show u an example okay
OpenStudy (anonymous):
Which is 78.5?
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OpenStudy (phebe):
What is the area of a circle with radius of 3 m ?
Area = π × r2
= π × 32
= π × (3 × 3)
= 3.14159 × 9
= 28.27 m2
OpenStudy (anonymous):
Ok
OpenStudy (phebe):
did u understand it?
OpenStudy (anonymous):
@swagmaster47 I got 78.5 now what do I do next?
OpenStudy (anonymous):
Go back a step. You see how each of your answers have a pi next to it?
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OpenStudy (anonymous):
Basically it means this\[x*\pi\]
OpenStudy (anonymous):
x being whatever number
OpenStudy (phebe):
yah thats what i got too but pi stands for 3.14 did u use it?
OpenStudy (anonymous):
and since our equation is\[5^2\pi\]
OpenStudy (anonymous):
Yes and got 78.5 I did 5 squared x Pie
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OpenStudy (anonymous):
What do you think we do?
OpenStudy (anonymous):
Divide?
OpenStudy (anonymous):
Would the answer be C?
OpenStudy (anonymous):
You could. The easier way would be not to multiply by pi at all so you start with \[5^2pi\] and end with \[25pi\]