Posted by Sylvie on .
Hello:
I am having difficulty witht the following math:
Question #1 If the area of a circle is 27 sq. in. What is the radius? I am coming up with an answer of 13.5 sq. in. Is that correct? If not, can you show me step by step how to get the answer?
Question #2 If the area of a circle is 108 cm to the second power, what is the radius?
Thanks.

math  5th grade 
Reiny,
Grade 5, that's pretty tough
The area of a circle is pi times the radius squared, so work it backwards
divide 27 by pi (on calculator) = 8.594
now take the square root of that to get a radius of 2.93 inches.
your answer is in square inches, that makes no sense.
How did you get 13.5 ?
Do the second question the same way as I showed you for the first, you should get 5.863 
math  5th grade 
Bianca,
If your circle is 27 sq in. Here is how you would work it out to find the radius.
A(area)=3.14(pie) times R(radius) times R
27sq in. = 3.14 x R x R=
27sq in/3.14 x R x R=
8.59 sq in x R =
8.59 sq rt= 2.93
So your radius = 2.93
hope this helps 
math  5th grade 
wendy,
i need help with my home work so whats another name for 3/8? and whats another name for 5/12 and whats another name for 6/10??? thank you

math  5th grade 
Gavin. Last name=Benda,
I'm in the 1st grade! no joke! And Wendy the answer is For five tenths is one half!