Posted by xleogirlx on Sunday, November 3, 2013 at 10:59pm.
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
- Math Can someone check my answers ? - DrBob222, Sunday, November 3, 2013 at 11:05pm
B looks ok to me but that looks like too many significant figures for the data you posted.
- Math Can someone check my answers ? - xleogirlx, Sunday, November 3, 2013 at 11:07pm
thats what my teacher gave me so it right ?
- Math Can someone check my answers ? - Jai, Sunday, November 3, 2013 at 11:09pm
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
- Math Can someone check my answers ? - xleogirlx, Sunday, November 3, 2013 at 11:14pm
yes i double checked with my teacher n the question is right
- Math Can someone check my answers ? - DrBob222, Sunday, November 3, 2013 at 11:55pm
Jai is right. Surface area confused me too but I assumed area since a one dimensional circle must be area.
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