Posted by **mike** on Tuesday, May 8, 2007 at 10:38pm.

can someone help me with these:Find the radius, diameter and circumference of a circle with an area of 64 cm2. Write your answers as decimals rounded to the nearest hundredth.

Find the circumference and area of a circle that has a rectangle inscribed inside it with sides that are 9 by 12 centimeters. Write your answer as decimals rounded to the nearest hundredth. (hint: Draw this circle on your paper and find the length of the diagonal of the rectangle.)

you should know that Area = πr^2

and circumference is 2πr

and clearly the diameter is 2r

ao πr2=64

r = 8/√π

evaluate using your calculator and substitute in the above expressions.

Round off AFTER you have substituted,not before.

For your second question they have given you an excellent hint.

I will give you one more...

the radius of the circle is half the length of the diagonal of the rectangle.

- Circumference and Area of Circles -
**J.Feliciano**, Monday, January 5, 2009 at 5:32pm
a 9x12 rectangle has diagonals of

d = (9^2 + 12^2) = 225 = 15

since these diagonals are also the diameter off the circle

A = (d/2)^2 = (15/2)^2 = 176.7

C = d = (15) = 47.123

- Circumference and Area of Circles -
**S. Creel**, Friday, April 24, 2009 at 12:27am
This question Find the circumference and area of a circle that has a rectangle inscribed inside it with sides that are 9 by 12 centimeters. Write your answer as decimals rounded to the nearest hundredth. (hint: Draw this circle on your paper and find the length of the diagonal of the rectangle.) is copyrighted material of Florida Virtual School. Please remove it and any solutions.

- Circumference and Area of Circles -
**J.Marks**, Wednesday, August 18, 2010 at 5:27pm
None of these are correct! Try doing your own work instead of copying off of stupid people that don't understand math!!!

- Circumference and Area of Circles -
**stefany martinez**, Tuesday, March 1, 2011 at 5:52pm
waht do we do on circumfrence?

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