Respuesta :
Answer:
see explanation
Step-by-step explanation:
The surface area (A) of a sphere is calculated as
A = 4πr² ← r is the radius, here r = 9, thus
A = 4π × 9² = 4π × 81 = 324π ≈ 1017.9 units²
Answer : The surface area of a sphere is, [tex]1017.36unit^2[/tex]
Step-by-step explanation :
To calculate the surface area of sphere, we use the formula:
[tex]A=4\pi r^2[/tex] .....(1)
where,
r = radius of sphere
A = surface area
Given :
Radius of sphere = 9 units
Now put all the given values in the above formula (1), we get:
[tex]A=4\times 3.14\times (9)^2[/tex]
[tex]A=1017.36unit^2[/tex]
Therefore, the surface area of a sphere is, [tex]1017.36unit^2[/tex]
