Question

what is the surface area of this sphere?
round your answer to the nearest hundredth.
20.4 yd
square yards

Explanation:

Step1: Find radius

Radius $r = \frac{\text{diameter}}{2} = \frac{20.4}{2} = 10.2$ yd

Step2: Apply surface area formula

Surface area $SA = 4\pi r^2 = 4\pi(10.2)^2$

Step3: Calculate the value

$10.2^2 = 104.04$, so $SA = 4\pi \times 104.04 = 416.16\pi \approx 416.16 \times 3.1416 \approx 1307.47$

Answer:

1307.47