Question

eighth grade > w.8 surface area of spheres njw
what is the surface area of this sphere?
round your answer to the nearest hundredth.
39.4 yd
square yards

Explanation:

Step1: Find radius of the sphere

The diameter is 39.4 yd, so radius $r = \frac{39.4}{2} = 19.7$ yd.

Step2: Apply surface area formula

Surface area of sphere: $4\pi r^2$. Substitute $r = 19.7$:
$4 \times \pi \times (19.7)^2 = 4 \times \pi \times 388.09$

Step3: Calculate and round

$4 \times 388.09 = 1552.36$; $1552.36 \times \pi \approx 1552.36 \times 3.1416 \approx 4877.07$

Answer:

4877.07