Find the SURFACE AREA of a sphere that has a diameter of 18 centimeters. Leave your answer in terms of pi.
SA = 4 * pi * r^2
http://www.math.com/tables/geometry/surfareas.htm
Remember, the radius is half the diameter.
I'll be glad to check your answer.
sa =4 x 3.14x 9^2
sa = 324 pie
Right
To find the surface area of a sphere, you can use the formula: A = 4πr^2, where A is the surface area and r is the radius.
Given that the diameter of the sphere is 18 centimeters, we can find the radius (r) by dividing the diameter by 2:
r = diameter / 2 = 18 cm / 2 = 9 cm
Now we can substitute the value of r into the surface area formula:
A = 4π(9 cm)^2
A = 4π * 81 cm^2
A = 324π cm^2
Therefore, the surface area of the sphere with a diameter of 18 centimeters is 324π square centimeters.