Question

find the surface area of this sphere
use 3.14 for π.
9 cm
surface area
of a sphere
sa = 4πr²
sa = ? cm²
round your answer to the nearest tenth

Explanation:

Answer:

To find the surface area of the sphere, we use the formula \( SA = 4\pi r^2 \), where \( r = 9 \) cm and \( \pi = 3.14 \).

First, calculate \( r^2 \):
\( 9^2 = 81 \)

Then, substitute into the formula:
\( SA = 4 \times 3.14 \times 81 \)

Calculate step - by - step:
\( 4\times3.14 = 12.56 \)
\( 12.56\times81 = 1017.36 \)

The surface area of the sphere is \( 1017.4 \) \( cm^2 \) (rounded to the nearest tenth).