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.
To find the surface area of a circle, you need to know its diameter or radius. The formula for the surface area of a circle is: A = πr^2, where A is the surface area and r is the radius.
In this question, you are given the diameter of the circle, which is 14 inches. The radius is half of the diameter, so the radius of the circle is 7 inches.
To find the surface area, substitute the value of the radius into the formula: A = π(7)^2 = 49π.
To get a decimal answer, you can use an approximation for the value of π. Let's consider π as 3.14.
Therefore, the surface area is approximately 49 × 3.14 = 153.86 in^2.
So the correct answer is B. 153.86 in^2.