MARCH 20,2012
AIM: HOW DO WE FIND THE AREA OF A CIRCLE ?
To find the area of the circle we need to use the formula: 
A= πr2
In the circle 
to find the area we need to know the radius 
at times the radius might not be given to us but since the diameter is twice of the radius we divide the diameter by 2.


For example:
           FIND THE AREA !

To find the area we need to know the radius but it isnt given to us. in that case like i said before divide the diameter by 2 to get the radius,
10/2 = 5 
the radius turns out to be 5.
when you have the radius then plug it in the formula: A= πr2
Next plug it in :
A=π(5)2
Do the exponent :
A=π (25)
final answer:
A=π25


Leave the answer in the pi form because with pi the answer is accurate. If you are to to round to the nearest tenth then round otherwise leave it as in form of pi.

you try:

Jessica is making a circular table cloth for an art project.  She wants half of the cloth to be a plain colored fabric and half to be a print fabric.  How many square yards of each fabric (to the nearest hundredthof a yard) will she actually be using if the diameter of the cloth is 6 feet?

Choose:  1.57 sq. yds  1.58 sq. yds  14.13 sq. yds  14.14 sq. yds

Sources:

regents prep.org for the you try and the little circle above.