Posted by Chase on .
I have two questions about two circles.
A.First circle shows half a line measuring 4mm using 3.14 for pie. I came up with an answer that is wrong.:(
B.Second circle same pie but with a line all the way across the circle measuring 18cm. I got this one wrong?
Please help with steps on each? I want to understand what I got wrong so I can do better.

Math Geo help Ms Sue? 
Ms. Sue,
What questions are you trying to solve?
Circumference? Area? ?? 
Math Geo help Ms Sue? 
Chase,
area

Math Geo help Ms Sue? 
Ms. Sue,
A. Radius = 4
A = pi * r^2
A = 3.14 * 4^2
A = 3.14 * 16
A = 50.24 sq. cm.
B. Radius = 9 cm
Solve this the same was that I solved A. 
Math Geo help Ms Sue? 
Chase,
I really understand thank you.

Math Geo help Ms Sue? 
Ms. Sue,
You're welcome. :)