A ball has a diameter of 8 inches. What is its surface area? (Use 3.14 for π.)

Question

lgbasallote · Answer

$$SA = 4\pi r^2$$
$$radius = \frac{diameter}{2} = \frac{8}{2} = 4 in$$

therefore
$$SA = 4(3.14)(4)^2$$
got it?

anonymous · Answer

anonymous · Answer

my choices are -200.96 in.2
803.88 in.2
401.92 in.2
100.48 in.2

lgbasallote · Answer

@miadeex calculate the one i gave you ;) it'll give you one of those

anonymous · Answer

lol how do i do that

anonymous · Answer

SA= 4*3.14*(4*4)

lgbasallote · Answer

multiply $$4 \times 3.14 \times 4^2$$

lgbasallote · Answer

you can use google, calculator, wolframalpha..or by hand..your choice ;)

anonymous · Answer

since the answers choices are not close to each other you can estimate the answer by simplifying the problem.

4*3*4*4

anonymous · Answer

Your answer would be 803.84 trust me(;

anonymous · Answer

The closest answer to that is what you get

lgbasallote · Answer

@JoannaiA i believe you did 8^2..not 4^2

anonymous · Answer

and i believe yu r most certanly correct i did it wrong would it be choice A then?
sorry tryed helping

lgbasallote · Answer

@miadeex what do you think would be the answer?

lgbasallote · Answer

and it's alright joanna :) let's try to see what mia got first then we'll discuss the answer

anonymous · Answer

as said by @JoannaiA you can estimate it by
4 x 3 x 4 x 4 = around 200 so ur answer should be 200.96

anonymous · Answer

thanks guys you all helped a ton it was 200.96

lgbasallote · Answer

yep it is