Question

pls can you guys explain me first two questions it will be a big help thank you​

Answer 1

Answer:

Surface area of sphere of radius means use

SA = 4πr²

Surface area if a sphere with diameter means use

SA = 4πd²/4  ⇒  SA = πd²

Now that you know the formulas, use them in the problem and get the answer...

Hope it helps...