Math Can someone check my answers ?
posted by xleogirlx on .
What is the surface area of a circle that has a diameter of 14 inches?
A. 49.86 in2
B. 153.86 in2
C. 196.86 in2
D. 616.86 in2
B

B looks ok to me but that looks like too many significant figures for the data you posted.

thats what my teacher gave me so it right ?

Are you sure it's "surface area" and it's "circle"? Because usually if the shape is 2D, the term is 'area' only.
If it's "area of a circle" only,
A,circle = pi*r^2
A,circle = 153.9 in^2 (closest to letter B)
If it's "surface area of a sphere",
SA,sphere = 4*pi*r^2
SA,sphere = 615.8 in^2 (closest to D)
hope this helps :3 
yes i double checked with my teacher n the question is right

Jai is right. Surface area confused me too but I assumed area since a one dimensional circle must be area.