A circular plate has a dinameter of 9 inches. What is the area of the plate?

Question

phi · Answer

do you know the formula for the area of a circle ?

anonymous · Answer

No

phi · Answer

Do you have notes or a book?  or google?

anonymous · Answer

Yea

anonymous · Answer

A=πr2

phi · Answer

ok, but it is better to write it
A= πr^2  (the ^ shows the 2 is a power)
it means r*r

so do use this formula you need to know pi.  it is (roughly) 3.14  or 22/7
any idea what r is ? i.e. what is the radius of your circle ?

phi · Answer

diameter is 9
diameter is all the way across
the radius is ½ of that

anonymous · Answer

81in

phi · Answer

you want to find the radius.  the radius is ½ of 9
or 9 divided by 2

that is 9/2 or 4.5 if you write it as a decimal

now do (22/7) * (9/2) * (9/2)
or do 3.14*4.5*4.5