Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/areaofacircle.php Students learn that the formula for the area of a circle is pi times radius squared, so the area of a circle that has a radius of 5 inches is pi times 5 squared, or 25 pi square inches. And since pi = 3.14, 25 pi square inches can also be written as 25 times 3.14, or 78.5 square inches. Note that the radius of a given circle is half the diameter of the circle. So to find the area of a circle with a given diameter, first find the radius of the circle by dividing the diameter by 2.
Duration : 0:2:38
[youtube eBAsK9jB91I]
she talks weird but …
she talks weird but great video it helped me!
ya just like I went …
ya just like I went freak on your mom last night haaaa…that was lame
Thanks for the …
Thanks for the videos. It is especially useful that you use d instead of r at the start.
Why not hey tap tap …
Why not hey tap tap tappy!!!
you are a freak
you are a freak
Pi = 3.14 OR 22/7
Pi = 3.14 OR 22/7
I’d tap that
I’d tap that
i hate …
(((((
i hate school
a lot is two words
a lot is two words
thxxxx alot
thxxxx alot
thanks it helped …
thanks it helped me study
yay im 13 and now i …
yay im 13 and now i can do my homework
thank you
thank you
whitney from the …
whitney from the hills lookalike teacher
!!
Don’t trip over it …
Don’t trip over it dude. I never knew how to do this and still graduated.
Brilliant! I love …
Brilliant! I love it. But also good to know why your method works by going back to classics. However, your method is much easier.
There is a much …
There is a much easier way to do it. This is how I do it.
Area = diameter X diameter X .785
(10.6 x 10.6 x .785 = 88.2026)
TOOOOOO easy.
wow your doing this …
wow your doing this in 8th grade im a sophomore in hs and we just started this lol
Lols, my tuition …
Lols, my tuition teacher do it easier LOL
singapore???
singapore???
@MyMorelia Don’t …
@MyMorelia Don’t worry hun, I’m a sophomore in college and I will risk sounding a little behind when I tell you that I am just now learning how to do this stuff. These videos really help me a lot.
no, pie is not the …
no, pie is not the correct spelling
its Pi
Im in 8th grade.
…
Im in 8th grade.
And i dont get this at alll!
Gawd!
F*** Einstein!
im in grade 7 and …
im in grade 7 and in term 2 and i dont understand a single word she just said and btw wtf is pie XD
teacher=pie x r …
teacher=pie x r retard2